The Hanging Gardens of Babylon is a wonder in Civilization Revolution. To build it, the player must first discover Pottery. This Great Wonder increases population of a city by 50%, which can really help to get your city up and growing. If the city that builds it has an odd population, it always rounds UP - a city of size 7 that builds it will become 11 (not 10), for example. For this reason, it may be advantageous to wait to build it if your city's population is even but will be odd soon, as it would then provide an extra population when finished - as long as no other civilization finishes it first!