Babylon

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. (SJA: Secrets of the Stars)

In 905 BC, the Eleventh Doctor and Amy Pond visited Babylon and stopped a Gryphon attack. (DWA: In the Stars)

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. (BNA: Walking to Babylon)

In 1827 an archaeological expedition excavating the ruins of Babylon experienced what seemed like omens, and found a stone tablet depicting a great demon standing above a city. (WEB: torchwood.org.uk)