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. transportation structures
9. transportation buildings
10. water transportation buildings

Additional parents:

1. top of the aat hierarchies
2. Objects Facet
3. Object Genres
4. object genres
5. object genres by function
6. aids to navigation

Anotations

Scope note:

Towers or other structures equipped with a powerful light or lights (originally a signal fire) at the top, erected at important or dangerous points on or near the coast for the guidance of mariners.