Here are some photos that I have taken and added to wikipedia. Most are under one (or more) of CC-By Attribution 4.0, GFDL, or CC-By Attribution 3.0. They were all added to articles, but some of them may have been replaced.

Memorials and Monuments

• Mems and Mons
• 
  The Adam Stephen memorial in Martinsburg, WV
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  Apollo 11 rocket projected on the Washington Monument
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  Vietnam Veterans Memorial, DC
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  The Jefferson Memorial at night
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  WWII Memorial under construction (Washington, DC) April 2003
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  WWII Memorial (Washington, DC) January 2004
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  Lincoln Memorial (Washington, DC)
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  Smithsonian Arts and Industries Building
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  Arts and Industries Building renovation (Washington, DC)
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  National Museum of American History (Washington, DC)
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  Fort McHenry (Maryland, USA)
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  The Flag at Fort McHenry
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  Frederick Douglass Memorial Bridge from the southwest, Washington, DC
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  John Ericsson Memorial, "Vision" portion, Washington, DC
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  Francis Scott Key Bridge from the Georgetown waterfront
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  Flooded bench at the Tidal Basin

Animals and Plants

• Plants and Animals
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  Titan Arum, AKA Corpse flower
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  Pileated Woodpecker
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  Magicicada Egg Slits
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  Cicada nymph on a plant (17-year cicada, Brood X)
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  Molting Cicada
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  Newly molted Brood X periodical cicada
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  Cicada nymph with fungus on abdomen
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  Multiple Molting Magicicada on Milkweed
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  Cicada with extensive fungus on abdomen
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  Two cicadas mating
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  Black-eyed susan
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  Giant Leopard Moth
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  Ajuga reptans
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  Amur honeysuckle flower
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  Flowering Dogwood leaves in the fall
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  Flowering dogwood closeup
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  Seeds and seed hairs from an Eastern Cottonwood

National Parks

California

• Schools in California
• 
  Hoover High School, Fresno, CA
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  McLane High School, Fresno, CA
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  Minarets High School, O'Neals, CA
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  Yosemite High School, Oakhurst, CA

Florida

• Brevard County, FL
• 
  Cocoa High School entrance, Brevard County, FL
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  Cocoa High School stadium, Brevard County, FL

Maryland

• Bethesda, MD
• 
  Bethesda Avenue at night
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  Marker at the start of the Bethesda Trolley Trail
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  Bethesda Trolley Trail
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  Bethesda Trolley Trail at the NIH Campus in Bethesda, MD
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  Bethesda Trolley Trail along Old Georgetown Road in Bethesda, MD
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  Bethesda Trolley Trail near Georgetown Preparatory School in North Bethesda, MD
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  Bethesda Trolley Trail at Edson Ln and Woodglen Dr in North Bethesda, MD
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  Bike lanes at Old Georgetown Rd and Beech Ave
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  Bikeshare Station: Old Georgetown Rd & Southwick St, Bethesda, MD
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  Physically separated bike lanes on Maryland Route 187, Old Georgetown Rd in Bethesda, MD
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  Maryland Route 187, Old Georgetown Rd at Kingswood Rd, Bethesda, MD
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  Chevy Chase Bank headquarters building in 2008
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  EagleBank headquarters, Bethesda, MD
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  Georgetown Preparatory School, entrance and sign, North Bethesda, MD
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  Host Hotels and Resorts Headquarters building, Bethesda, MD
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  Western end of East-West Hwy, Bethesda, MD
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  Southern end of Old Georgetown Road, Bethesda, MD
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  Metro Station: Bethesda station
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  Village of Martin's Additions, MD, sign at entrance
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  Sign and one of the two roads in the town of Oakmont, Maryland.
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  Suburban Hospital main entrance, Bethesda, MD
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  KID Museum entrance, Bethesda, MD
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  Entrance to the KID Museum in Bethesda
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  WMAL radio towers
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  Madonna of the Trail monument
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  Ike Leggett
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  Westfield Montgomery, black Friday 2021

• North Bethesda, MD
• 
  Linden Oak before it was removed
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  Linden Oak stump
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  Bethesda Market East, North Bethesda, MD
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  Nuclear Regulatory Commission, North Bethesda, MD
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  Pike & Rose development and sign

• Schools in Montgomery County, MD
• 
  James Hubert Blake High School entrance, Cloverly, MD
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  Clarksburg High School building, Clarksburg, MD
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  Clarksburg High School Coyotes stadium, Clarksburg, MD
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  Damascus High School electronic sign, Damascus, MD
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  Albert Einstein High School main entrance, Kensington, MD
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  Einstein High School, Montgomery County, MD
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  Gaithersburg High School
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  Holton-Arms School sign
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  John F. Kennedy High School main entrance, Wheaton-Glenmont, MD
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  Col. Zadok Magruder High School building, Rockville, Maryland
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  Montgomery Blair High School, Silver Spring, MD
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  Montgomery College, Germantown. Student Affairs and Science building.
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  Montgomery College Rockville, building with college name
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  Northwest High School, Germantown, MD
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  Northwood High School main entrance, Montgomery County, MD
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  Northwood High School, Montgomery County, MD
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  Quince Orchard High School main entrance, Gaithersburg, MD
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  Quince Orchard High School, Gaithersburg, MD (I later replaced it with a different one)
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  Richard Montgomery High School entrance, Rockville, MD
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  Rochambeau French International School, Bethesda, MD
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  Rockville High School main entrance, Rockville, MD
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  Sherwood High School main entrance, Sandy Spring, MD
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  Springbrook High School, Silver Spring, MD
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  The entrance to Thomas Edison High School of Technology in Wheaton, MD
• 
  Walt Whitman H.S., Bethesda, MD. I have replaced this with a more recent photo
• 
  Walt Whitman H.S., Bethesda, Maryland
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  Walter Johnson High School entrance, Bethesda, MD
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  Walter Johnson H.S., Bethesda, MD
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  Washington Waldorf School sign, Bethesda, MD
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  Watkins Mill High School, Gaithersburg, MD
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  Wheaton High School building and entrance. Wheaton, MD
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  Wheaton High School stadium
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  The demolition of Woodward High School / Tilden Middle School, North Bethesda, Maryland
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  Winston Churchill High School sign, Potomac, MD
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  Wootton High School main entrance, Rockville, MD
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  Wootton High School, Rockville, MD

• Places in Montgomery County, Maryland
• 
  Adventist HealthCare White Oak Medical Center
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  Adventist HealthCare White Oak Medical Center, Silver Spring (ish)
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  Burnt Mills Community, sign, Silver Spring, MD
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  The Village of Chevy Chase Section Three, MD
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  Road and Sign for Chevy Chase View, MD
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  Chevy Chase Village, village hall, MD
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  Colesville welcome sign, Randolph Rd
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  Damascus, Maryland water tower
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  Glenmont welcome sign, Randolph Rd
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  Muddy Branch Stream near Esworthy Rd in Montgomery County, MD
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  Glen Echo Town Hall, MD
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  Kensington MARC Station, Kensington, MD
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  Central area of Lakeforest Mall
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  Lakeforest Mall, Yellow entrance
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  Metropolitan Grove MARC station, far platform, Gaithersburg, MD
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  Muddy Branch Stream behind Morris Park, Gaithersburg, Maryland
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  Muddy Branch Stream and Trail, Montgomery County, MD
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  Muddy Branch Greenway Trail through a grassy forest
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  Muddy Branch Greenway Trail, Query Mill trailhead in Montgomery County, MD
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  Village of North Chevy Chase, MD, sign
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  The Paint Branch, a stream in White Oak, Maryland
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  Paint Branch Trail in Montgomery County, MD
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  Rock Run at its confluence with the Potomac River
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  Rock Run where it crosses under the C & O Canal
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  Rockville Cemetery, Rockville, Maryland
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  Seneca Creek and the Seneca Creek Greenway Trail near Berryville Road in Darnestown, MD
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  The entrance to Seneca Creek Greenway Trail at Seneca Rd in Darnestown, MD.
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  Seneca Creek Greenway Trail between MD-355 and Watkins Mill Rd
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  Seneca Creek Greenway Trail parking area at MD-355
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  A foot bridge on the Seneca Creek Greenway Trail
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  Seneca Creek Greenway Trail and Seneca Creek
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  Ferns along the Seneca Creek Greenway Trail
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  Sligo Creek Parkway in Silver Spring, MD
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  Sligo Creek Trail, crossing Sligo Creek in Silver Spring, MD
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  Sligo Creek Trail in Silver Spring, MD
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  Sligo Creek with the Sligo Creek Trail in the background.
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  Sligo Creek Trail
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  Burnt Mills Dam, Northwest Branch of the Anacostia River
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  Northwest Branch Trail in Silver Spring, MD
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  The Northwest Branch at the Fall Line
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  The Rachel Carson Greenway Trail north of Burnt Mills in Montgomery County, MD
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  Harper family homestead at Wheaton Regional Park

• Places in Howard County, Maryland
• 
  Atholton High School, Columbia, MD
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  Centennial High School entrance, Ellicott City, MD
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  Hammond High School entrance, Columbia MD
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  Entrance sign for Howard Community College, Columbia, MD
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  Jim Rouse Theatre at Wilde Lake High School, Howard County, MD
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  Wilde Lake High School stadium, Howard County, MD

• Places in Prince George's County, Maryland
• 
  High Point High School sign and building, Beltsville, MD
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  Oxon Hill High School,

• Places in Washington County, Maryland
• 
  Hancock Middle-Senior High School entrance, Washington County, MD
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  Washington County Technical High School building, Hagerstown, MD
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  Antietam Academy, Hagerstown, MD

• Places in Maryland
• 
  Wings in the water exhibit at the Baltimore Aquarium
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  Patuxent National Wildlife Visitor Center entrance sign
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  Redbud tree and bench at Patuxent Research Refuge
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  Pratt Street Power Plant
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  Inner Harbor from the Baltimore Aquarium
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  The Monocacy River (foreground) at it's confluence with the Potomac River

Pennsylvania

• Pennsylvania
• 
  Penn Hills Senior High School sign, Pittsburgh, PA
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  Woodland Hills High School soccer field, Pittsburgh, PA

Massachusetts

• Boston
• 
  Samuel Adams grave marker in Boston, MA
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  Boston Massacre grave marker
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  Dodge Hall, Northeastern University, Boston, MA

New Mexico

• Schools in New Mexico
• 
  Bernalillo High School wall sign, NM
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  Cibola High School entrance, Albuquerque, NM
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  Rio Rancho High School building, Rio Rancho, NM
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  Santa Fe High School main entrance, Santa Fe, NM
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  Cleveland High School front, Rio Rancho, NM
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  St. Pius X High School sign, Albuquerque, NM
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  Volcano Vista High School front, Albuqueque, NM

• Other New Mexico
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  progression of eclipse taken from fixed camera location taken in Petroglyph National Monument
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  Lamy Building, Santa Fe, NM
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  P.E.R.A. Building, Santa Fe, NM
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  Rio Grande River Trail in Rio Grande Valley State Park, Albuquerque, NM
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  Sandia Cave interior, Sandoval County, New Mexico
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  New Mexico State Road 165 looking west
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  Unimproved portion of NM-165
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  New Mexico State Road 536, the Sandia Crest Scenic Highway
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  New Mexico State Road 313 in Bernalillo, NM
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  Rio Rancho, NM welcome sign

New York

• New York
• 
  A bridge in Central Park
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  Flatiron Building, NYC
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  Sign and horse, School of the Arts, Rochester, New York
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  School Without Walls front entrance, Rochester, NY
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  Taughannock Creek upstream of Taughannock Falls NY

Places

• Other Places
• 
  The Chain Bridge.
• 
  The Chain Bridge from Little Falls
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  The Zoo in DC
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  Palmer, Puerto Rico US Post Office
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  Door painted with a Puerto Rican flag, Calle de la Virtud, Viejo San Juan, Puerto Rico
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  Comunidad La Perla sign
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  Polo Norte, Calle de Tetuan, Viejo San Juan, Puerto Rico
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  Playa Negra and the ocean

Oklahoma

• Schools in Oklahoma
• 
  Main entrance to Charles Page High School, Sand Springs, OK
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  Memorial High School main entrance, Tulsa, OK
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  Union High School building, Tulsa, OK

• Tulsa, Oklahoma
• 
  Philtower Building lobby ceiling detail
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  Philcade Building lobby hall

West Virginia

• Schools in West Virginia
• 
  American Public University System office
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  Berkeley Springs High School main building
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  Hedgesville High School entrance doors, Berkeley County, WV
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  Hedgesville High School, Mumaw Stadium, Berkeley County, WV
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  Jefferson High School building, Shenandoah Junction, WV
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  Martinsburg High School entrance, Berkeley County, WV
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  Cobourn Field at Martinsburg High School, Berkeley County, WV

• Places in West Virginia
• 
  The corner of Fairfax St and Washington St, Berkeley Springs, WV
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  Martinsburg station sign, Martinsburg, WV
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  Martinsburg station, Martinsburg, WV
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  Ranson, West Virginia welcome sign
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  Independent Fire Company Inc, Ranson, WV

Virginia

• Schools in Virginia
• 
  Chancellor High School entrance, Fredericksburg, VA
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  The front of Cooper Middle School, McLean, VA
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  Courtland High School entrance, Spotsylvania, VA
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  George C. Marshall H.S. entrance, Falls Church, VA
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  Gar-Field Senior High School sign, Woodbridge, VA
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  Glen Allen High School entrance, Glen Allen, Virginia
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  Glen Allen High School Stadium, Glen Allen, VA
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  Henrico High School sign
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  Hermitage High School sign, Henrico, VA
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  James Blair Middle School entrance, Williamsburg, VA
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  Main entrance to J. R. Tucker High School, Henrico, VA
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  Langley High School main entrance, McLean, VA
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  The front of Massaponax High School, Fredericksburg, VA
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  McLean High School entrance, McLean, VA
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  McLean High School football field, McLean, VA
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  H.W. Longfellow Middle School building and entrance, Falls Church, VA

• Places in Virginia
• 
  Chesapeake Western Railway terminal, Harrisonburg, Virginia
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  Rockingham Milling Company main mill building, Harrisonburg, Virginia
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  Ruth Bader Ginsburg grave marker

Streetcars

Misc.

Aircraft and Such