underground structure
man-made underground structure
adit
horizontal entrance shaft to an underground mine
cavern
large underground space
Raven Rock Mountain Complex
architectural structure
underground infrastructure system
bunker; important government or military infrastructure built below ground
Carrousel du Louvre
underground shopping mall in Paris, France
underground base
base located underground
catacombs
subterranean passageways used as burial place
roadway
tunnel in mine workings with regular, fairly uniform cross-section
pneumatic transport in Berlin
German pneumatic tube postal service (1865-1976)
pneumatic transport in Berlin
German pneumatic tube postal service (1865-1976)
Far Caves
church building at Kyiv-Pechersk Monastery
Taller Rancagua
workshop of Buenos Aires Metro
rock engineering
engineering in rock masses
mine
place for the extraction of minerals
pneumatic tube
system that propels cylindrical containers through tubes by compressed air
Grain Earth House
underground building in Orkney Islands, Scotland, UK
underground parking facility
subterranean parking lot
tunnel
underground passageway
root cellar
structure, usually underground or partially underground, used for storage of vegetables, fruits, nuts, or other foods
Near Caves
church building in Kyiv, Ukraine
Military Preparedness Museum
is Sweden's only museum having preserved underground defense facility from the Second World War with the secret artillery battery of Helsingborg.
deep bunker
subterranean space for civil or military usage
tunnel network
network of tunnels used for storing or transporting people or material items
refilling of shafts
maintenance-free and effective closure of a disused shaft
mine opening
generic term for various typs of cavities in mining
M. S. Factory, Valley
Former WWII site in Flintshire, Wales
cellar
room, often wholly or mostly below ground level, used for storage of food and often other items
souterrain
type of underground structure associated mainly with the Atlantic Iron Age