Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Open Spaces and Site Elements (hierarchy name )
5. open spaces
6. [open spaces by form]
7. gardens (open spaces)
8. [gardens by form]

Anotations

Scope note:

Gardens or plantings that are on a steep slope, on a stepped pyramid or ziggurat, on the top of a wall, on a roof, or otherwise situated so as to hang over the ground below or to appear to float. The most famous example was the hanging gardens of Babylon, one of the seven wonders of the ancient world.