Hanging Gardens of Babylon
The Hanging Gardens of Babylon (also known as the Hanging Gardens of Semiramis) and the walls of Babylon were considered one of the Seven Wonders of the World. They were both supposedly built by Nebuchadnezzar around 600 BC (present Iraq). However, there is doubt as to whether they ever physically existed.
The Hanging Gardens are extensively documented by Greek historians such as Strabo and Diodorus Siculus, but otherwise there is little evidence for their existence. Some (circumstantial) evidence gathered at the excavation of the palace at Babylon has been accrued, but does not completely substantiate what look like fanciful descriptions.
Some schools of thought think that through the ages the location may have been confused with gardens that existed at Nineveh as tablets from there clearly showing gardens have been found. Writings on these tablets describe the possible use of something similar to an Archimedes' screw as a process of raising the water to the required height.
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