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Ali Sadr, Iran
Ali Sadr Cave
This vast, water-filled underground labyrinth can only be toured by boat.
Added by fafafariba
Sala Silver Mine Hotel Suite
This luxury hotel suite is located deep in the bowels of an old mine.
Added by hrnick
Berliner Unterwelten - Subterranean Berlin
A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.
Added by Christine Williamson
North Yorkshire, England
The largest cave chamber in Britain—big enough to fit a whole cathedral inside.
Added by Dr Alan P Newman
Crazy lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.
Added by Zen13
Sewers of Barcelona
Barcelona's historic 19th century sewers, whose foundations were laid in medieval times, are open to the public for exploring.
Added by FelipeTrigo
The Drowned Church of Potosi
A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.
Andros I, Bahamas
Subsurface Bahamian Caves
Inhospitable caverns just beneath this island paradise offer insights into alien worlds.
Weeki Wachee, Florida
Weeki Wachee: City of Live Mermaids
Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors
Key Largo, Florida
Underwater Hotel in Key Largo
Stay in a room with a view... of the bottom of the ocean.
Witley Wonder Underwater Ballroom
The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.
Big Pine Key, Florida
Underwater Music Festival
For deep-sea divers and music lovers, the Florida Key's Underwater Music Festival provides the best of both worlds.
Deep Throat Parking Garage
Parking garage where Bob Woodward met Watergate source "Deep Throat."
Buffalo Bayou Park Cistern
A 90-year-old underground water reservoir offers a more industrial kind of tranquility.
Added by aconstantinou
Montreal's colorful subway station showing its support of the local LGTB community
Added by Jennifer Richardson
A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.
Added by PencilHB
This picturesque Umbrian city has a subterranean side that has long remained hidden.
Added by alleywaykid
Prague, Czech Republic
The hidden lair of an alchemist rediscovered in a 2002 flood.
Added by luschippa
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