Babylon was a city-state in Mesopotamia on Earth.
It played an important role in human history. In the 16th century BC the concept of astrology first appeared on Earth in this city. (TV: Secrets of the Stars)
In 2000 BC, the Ninth Doctor and Ali stopped a Starman from destroying the city. (PROSE: The Beast of Babylon)
In 905 BC, the Eleventh Doctor and Amy Pond visited Babylon and stopped a Gryphon attack. (COMIC: In the Stars)
In May 323 BC, the First Doctor and his companions Susan Foreman, Ian Chesterton and Barbara Wright met Alexander the Great in Babylon, ultimately being present for his death the following month. (AUDIO: Farewell, Great Macedon)
The Ikkaba visited Babylon and inspired its people to build pyramids. The People also visited the city, through a time pad, as did Bernice Summerfield. (PROSE: Walking to Babylon)
Iris Wildthyme and Panda once visited Babylon and were accused of stealing the tablets of destiny. Thanks to all the feathers on her hat, Iris was thought to be the goddess Siris. (PROSE: Wildthyme and the Wolf)