Of the seven Wonders of the World, none has fired peoples's imagination as much as the Hanging Gardens of Babylon. There are no descriptions of them by writers who lived at the time, but stories about them were passed down by word of mouth and the legend grew of an earthly paradise rising out of the desert. A Roman writers visited the gardens long after the fall of Babylon and found them still standing. He described them as a series of vaulted terraces, built pyramid-like, one on top of others, and flanked by walls 7.6m (25ft) thick. Each terrace contained solid, deep enough for tree to grow. 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. Diodorus Siculus
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. Diodorus Siculus
Diodorus Siculus