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]
8. recreation structures
9. recreation buildings
10. sports buildings
11. [sports buildings by form]

Anotations

Scope note:

Oblong enclosures curved at one end and built for horse and chariot racing, usage is typically restricted to such structures in Greek cities of the Hellenistic, Roman, and Byzantine eras; meaning overlaps with similar structures in ancient Rome itself, "circuses (Roman arenas)." For sports structures used for horse racing in more modern contexts, use "horse racetracks."