Authority control databases: National
Germany
Category: Diatremes
Subterranea
Natural features
Types
Alcove
Ant colony
Aquifer
Burrow Burrow fossil
Communal burrow
Paleoburrow
Cave Glacier cave
Grotto
Ice cave
Lava cave
Lava tube
Pit Cave
Show cave
Solutional cave
Cenote
Karst
Lava tree mold
Magma chamber
Maternity den
Pit crater
Rock shelter
Sinkhole
Subterranean river
Subterranean waterfall
Underground lake
Volcanic pipe
Warren
Exemplars
Balve Cave
Castellana Caves
Hang Sơn Đoòng
Jewel Cave National Monument
Kazumura Cave
Lechuguilla Cave
Mammoth Cave National Park
Reed Flute Cave
Veryovkina Cave
Wind Cave National Park
Man-made features
Types
Air raid shelter
Basement
Burial vault
Borehole
Bunker
Blast shelter
Catacombs
Casemate
Crypt Mausoleum
Dungeon
Dugout (shelter)
Dry well
Earth shelter
Erdstall
Fallout shelter
Fogou
Foxhole
Hypogeum
Manhole
Mine
Missile launch facility
Passage grave
Quarry
Rock-cut tomb
Root cellar
Tunnel
Utility vault
Underground city
Underground base
Underground hangar
Well
Wine cave
Subway system
Secret passage
Semi-basement
Sewerage Septic tank
Stepwell
Storm cellar
Smuggling tunnel
Spider hole
Ventilation shaft
Exemplars
816 Nuclear Military Plant
Caves of Maastricht
The Caves of Ægissíða
Almadén Mercury Mines
Coober Pedy
Cheyenne Mountain Complex
Chicago Tunnel Company
Houston tunnel system
Kosvinsky Kamen
Kőbánya cellar system
Kome Caves
Underground City (Beijing)
Underground City, Montreal
Underground Great Wall of China
Maginot Line
Mines of Paris
Mustang Caves
Mount Yamantau
Mogao Caves
Naples underground geothermal zone
North American Aerospace Defense Command
Raven Rock Mountain Complex
Shanghai tunnels
Subterranean London
Subterranean Toledo
Turda Salt Mines
Yaodong
Fictional features
Types
Hollow Earth
Subterranean fiction
Exemplars
Allegory of the cave
Batcave
Greek Underworld
Journey to the Center of the Earth
Moria (Middle-earth)
Nome Kingdom
Pellucidar
Subterranea (comics)
Tunnels in popular culture
Underdark
Underland (Narnia)
Wonderland (fictional country)
Organisations
American Society of Reclamation Sciences
Bergamt
Cave Research Foundation
History of hard rock miners' organizations
National Mine Map Repository
National Mining Association
National Speleological Society Grotto
Institute of Materials, Minerals and Mining
Institution of Mining Engineers
International Union of Speleology
Research Centre for Deep Drilling
Society of Economic Geologists
Southern African Institute of Mining and Metallurgy
Related topics
Cave conservation
Cave dweller
Cave diving
Cave gate
Cave rescue
Cave painting
Caving
Civil defense
Tunnel warfare
Tunnel network
Trench warfare
Underground construction Tunnel construction
Underground living
Mine rescue
Mine exploration
Mining engineering
Mole people
Speleology
Subterranean warfare
https://en.wikipedia.org/wiki/Volcanic_pipe
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