We’re fascinated by man-made and man-used underground places — from mines to railway tunnels, military defences to nuclear bunkers and everything in between.
A nice list. Mine is bigger than yours!
Design And Construction of underground spaces. Some exist, some dont.
19th-century photographer explored the subterranea of Paris.
Dozens of underground site, all located below the city of Naples.
A list of tropes pertaining to subterranean locations, the things found therein and stories set in underground places. Fictitious but quite entertaining.
Nice list, but only five.
A nice list of underground hotels, its not our specialty, so we have not all of them listed yet...