The ruins of Babylon are approximately 50 miles southwest of modern day Baghdad, Iraq and this is were the most widely accepted story begins.
Greek historians, Strabo and Diodorus Siculus, visited the beautiful hanging gardens recording dimensions and what they saw. Strabo's references place the Hanging Gardens near the Euphrates River. Strabo also provided this detailed description of the Hanging Gardens.
"The Garden is quadrangular, and each side is four plethra long. It consists of arched vaults which are located on checkered cube-like foundations.. The ascent of the uppermost terrace-roofs is made by a stairway..."
"The Hanging Garden has plants cultivated above ground level, and the roots of the trees are embedded in an upper terrace rather than in the earth.
Diodorus Siculus provided his description of the Hanging Gardens. "The approach to the Garden sloped like a hillside and the several parts of the structure rose from one another tier on tier. On all this, the earth had been piled…and was thickly planted with trees of every kind that, by their great size and other charm, gave pleasure to the beholder. The water machines [raised] the water in great abundance from the river, although no one outside could see it."
Based on the descriptions, water was raised to the top of the Hanging Gardens and allowed to trickle down, irrigating the plants on each level of the garden.
The Hanging Gardens of Babylon was the only Wonder from the Ancient Wonders of the World that cannot be proven to have existed. Only in ancient writings do we find references to the Hanging Gardens existing, but no physical proof has yet to be uncovered.