Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]

Anotations

Scope note:

Ancient structures using evaporative cooling systems, employing windcatchers and water brought from nearby springs to produce cold or even freezing conditions for storing food or ice. Developed in ancient Persia; yakhchals had a domed-shape structure above ground and a large subterranean storage space.