|Builder||Alexander the Great|
Alexandria in Arachosia ( Greek: Ἀλεξάνδρεια Ἀραχωσίας) also known as Alexandropolis (Ἀλεξανδρόπολις)  was a city in ancient times that is now called Kandahar in Afghanistan. It was one of more than twenty cities founded or renamed by Alexander the Great. It was founded around 330 BC, on the foundations of an earlier Achaemenid fortress.  Arachosia is the Greek name of an ancient province of the Achaemenid, Seleucid and Parthian empires. The province of Arachosia was centered around the Argandab valley in Kandahar. It did not reach the Hindu Kush, but it apparently extended east as far as the Indus River, although its exact extents are not yet clear. 
After the conquests of Alexander the Great, Arachosia was ruled by the Satrap Sybirtius. In the 3rd century BC, it is thought that the ambassador to the Indian court Megasthenes departed from the city to visit India:
Beyond is Arachosia. And the Parthians call this White India; there are the city of Biyt and the city of Pharsana and the city of Chorochoad and the city of Demetrias; then Alexandropolis, the metropolis of Arachosia; it is Greek, and by it flows the river Arachotus. As far as this place the land is under the rule of the Parthians. 
The remains of Alexandria in Arachosia are today found in the tell of Old Kandahar citadel in the western portion of the modern city. The citadel tell was excavated by the British Society for South Asian Studies through the 1970s and with the relative improvement in security from 2008 to 2009.
These excavations indicate that the Islamic walls were based on those from classical times, indicating what might be a square (tetragonis) shaped town, but one highly modified by the unusual topography. A triangular-shaped portion of the tell adjoining the Greek town is from the Buddhist era.
Alexander appears to have founded his town on the site of a 6th-century BC Persian garrison point. The pass, river and junction of three long-distance trade routes made the location of strategic importance. To date, no Greek buildings have been found, but numerous coins, inscriptions and graves have been. Further discoveries are anticipated as excavation reaches deeper strata of the tell.
Ruins of Alexandria Arachosia (1638)
New Kandahar (1881)
Mercator Map (1578) - Asiae-Tabula IX