Wikipedia:Selected anniversaries/April 21
On April 21:
- 753 BC - Romulus and Remus are said to have founded Rome.
- 1918 - German WWI fighter ace "The Red Baron" was shot down and killed.
- 1956 - An Elvis Presley song reached the top of the music charts for the first time.
- 1960 - Brazil's capital Brasília was officially inaugurated.
- 1970 - The Hutt River Province "seceded" from Australia.