There are 247 items filed under subterranean sites.

New Athos, Georgia

New Athos Cave

The second largest in the world, this massive underground void has its own subway
14 Oct 2014
Waxahachie, Texas

Superconducting Super Collider

A Texas-sized particle collider that was abandoned due to its Texas-sized budget
10 Oct 2014
Pilsen, Czech Republic

Pilsen Historical Underground

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries
07 Oct 2014
Nevşehir Province, Turkey

Kaymaklı Underground City

While not Turkey's deepest underground city, this subterranean redoubt is the largest
22 Sep 2014
Nevşehir Province, Turkey

Derinkuyu Underground City

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors
19 Sep 2014
Nevşehir, Turkey

Özkonak Underground City

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances
18 Sep 2014
El Paso County , Colorado

Cheyenne Mountain Nuclear Bunker

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational
17 Sep 2014
Paola, Malta

Ħal Saflieni Hypogeum

This subterranean necropolis holds three floors of antler-dug grave caves
10 Sep 2014
West Liberty, Ohio

Ohio Caverns

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King"
19 Aug 2014
Brighton and Hove, England

Brighton's Victorian Sewers

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today
05 Aug 2014
Hinterbrühl, Austria


This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day
28 Jul 2014
Melbourne, Australia

Melbourne Storm Tunnels

The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers
24 Jul 2014
Bedford, Indiana

Bluespring Caverns

The longest navigable underground river in the U.S. is home to countless blind and albino animals
14 Jul 2014
Taingy, France

Carrière d'Aubigny

This former limestone quarry is now a subterranean wonderland of grand stonework
02 Jul 2014
Nelson, Nevada

Techatticup Mine

This famous Nevada gold mine was once a hotbed of Wild West shenanigans and is now open for tours
19 Jun 2014
Borino, Bulgaria

Devil's Throat Cave

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat
11 Jun 2014
Coober Pedy, Australia

Crocodile Harry's Underground Nest & Dugout

This eccentric cave dwelling is bizarre even by the standards of a subterranean town
02 Jun 2014
Blaenafon, Torfaen

Big Pit National Coal Museum

Go deep down into the earth to experience the world of Welsh coal miners
15 May 2014
Reykjavik, Iceland


One of the most remarkable caves in all of Iceland was created by a once raging river of lava
18 Apr 2014
Budapest, Hungary

Hospital in the Rock

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest
12 Feb 2014
Ternopil's'ka Oblast, Ukraine

Priest's Grotto

A subterranean Holocaust refuge within one of the world's longest cave systems
04 Feb 2014
Slaughter Beach , Delaware

Redbird Reef

Decommissioned NYC subway cars are dumped into the ocean to create this underwater wildlife habitat
28 Jan 2014
Landrethun-le-Nord, France

Forteresse de Mimoyecques

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon
20 Dec 2013
Bonne Terre, Missouri

Bonne Terre Mines

The world's largest man-made underground caverns offer unparalleled underwater wonders
16 Dec 2013