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. monuments
9. [monuments by form]
10. megalithic monuments

Anotations

Scope note:

Designates circular areas bounded by a ditch and an enclosing embankment, the whole usually surrounding a circle or circles of standing stones or wood posts. For prehistoric circular enclosures of well-spaced large upright stones only, lacking bordering features, use "cromlechs."