Tour the Hanging Gardens, one of the Seven Wonders of the Ancient World. From there, it's up to you.
According to Wikipedia, "The Hanging Gardens were described as a remarkable feat of engineering: an ascending series of tiered gardens containing all manner of trees, shrubs, and vines. The gardens were said to have looked like a large green mountain constructed of mud bricks." Come and see the Hanging Gardens of Babylon for yourself. We encourage you to build around this wonder, perhaps have students create their own ancient society, or build their own local "Wonders of the World."