The Hanging Gardens of Babylon were an ancient tiered garden in Babylon, which was one of the Hellenic Seven Wonders of the Ancient World.
Background[]
The gardener exam at the Pioneer Scout camp has a question that directly references the structure. It asks "Mary wants to grow a spectacular garden, with all the best plants she can find. She wants to model her garden off of a legendary Wonder of the World. Which garden should she use as her model?" The Hanging Gardens of Babylon is the correct answer to the question.[1]
Appearances[]
The Hanging Gardens of Babylon are mentioned only in the Fallout 76 update Wild Appalachia.