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 condition]

Anotations

Scope note:

Structures, which are constructions of any kind artificially fabricated, that are deemed significant in the history of architecture or engineering, or that played significant historic roles in local cultural or social development. Includes not just buildings, but other structures, for example oil wells, bridges, docks, and railroads.