2-368-657 - Samuel Magal/Sites & Photos/Heritage Images

Mosaic on the floor of the House of Bacchus and Arianna, Ostia Antica, Italy. Ostia Antica was once the harbour city of ancient Rome. Although some sources say that the city was founded by Ancus Marcius, the semi-legendary fourth king of Rome, in the 7th century BC, the oldest archaeological remains so far discovered date only from the 4th century BC. The most ancient buildings currently visible are from the 3rd century BC.