|NOTES||Use for structures constructed wholly or mostly beneath the surface of the ground.|
|HIERARCHY||Objects Facet>Built Environment>Single Built Works>underground structures|
Search works with
Search for works of art which specifically
contain the subject "underground structures" subject or works within the subject tree Infobox:
equal to "underground structures" or that is a sub-subject of "underground structures"
Searching the subject tree for "underground structures" would return results containing subjects like:
underground structures (with subject tree: Objects Facet>Built Environment>Single Built Works>underground structures)