Hanging Gardens of Babylon
The Hanging Gardens are the only one of the Seven Wonders for which the location has not been definitively established. There are no extant Babylonian texts that mention the gardens, and no definitive archaeological evidence has been found in Babylon.
It was described as a remarkable feat of engineering with an ascending series of tiered gardens containing a wide variety of trees, shrubs, and vines, resembling a large green mountain constructed of mud bricks.
According to one legend, the Hanging Gardens were built alongside a grand palace known as The Marvel of Mankind, by the Neo-Babylonian King Nebuchadnezzar II (who ruled between 605 and 562 BC), for his Median wife Queen Amytis, because she missed the green hills and valleys of her homeland.
A number of descriptions concurred that the gardens were located near the royal palace and were set upon vaulted terraces. They were also described as having been watered by an exceptional system of irrigation and roofed with stone balconies on which were layered various materials, such as reeds, bitumen, and lead, so that the irrigation water would not seep through the terraces.