gwenleif's User Profile - Atlas Obscura
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San Andrés Cholula, Mexico

The Great Pyramid of Cholula

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.
Brooklyn, New York

Atlantic Avenue Tunnel

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).
Penteli, Greece

Davelis Cave on Pendeli Mountain

Hideout of thieves, monks, and goat-footed gods.
Athens, Greece

Antikythera Mechanism

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.
Mesopotamos, Greece

Necromanteion of Ephyra

Ancient Greek oracle of the dead.
Toxteth, England

The Ancient Chapel of Toxteth

17th century puritan church with connections to the Salem Witch Trials.
Liverpool, England

Williamson Tunnels

19th century tunnels burrowed under Liverpool.
Belgrade, Serbia

'Roman Well' of the Belgrade Fortress

A misnamed well, with a deep dark past.
Groton, Connecticut

Gungywamp

The kind of mixed-up place that drives archaeologists crazy.
Vienna, Austria

Stephansdom Crypt

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.
Samarkand, Uzbekistan

Ulugh Beg Observatory

Light still pours into the ruins of this ancient Islamic observatory.
Coober Pedy, Australia

Coober Pedy

An opal mining town in the middle of Australia where people live, worship, and shop underground.
Kronshtadt, Russia

Fort Zverev

Nightmarish example of the unintended consequences of weapons testing.
White Sulphur Springs, West Virginia

Congressional Fallout Shelter at the Greenbrier Resort

America's post-nuclear-attack chambers of Congress.
Clifton, New Jersey

Clifton's Gates of Hell

Series of storm drains connected to a dark urban legend.
Tomigusuku, Japan

Naval Underground Headquarters

Elaborate series of tunnels where traces of mass suicide are still visible.
Nughedu Santa Vittoria, Italy

Domus de Janas Tombs

Ancient cave tombs known as the "houses of fairies."
Vienna, Austria

Habsburg Imperial Crypt

The final resting place for the remains of 143 Habsburg royalty.
Xuân Trạch, Vietnam

Hang Son Doong

World's largest cave was only discovered in 1991, and now offers tours to the public.
Odesa, Ukraine

Odesa Catacombs

The largest catacomb system in the world.
Saint-Georges-des-Sept-Voies, France

Helice Terrestre Trogolodyte Tunnels

Beautiful carved tunnels.
Ware, England

Scott's Grotto

Fantastically decorated underground chambers built in the 1760s.
Titulcia, Spain

Cave of the Moon

Mysterious Spanish catacombs of unknown origins.
Maastricht, Netherlands

St. Pietersberg Caves

Incredible labyrinth of man made caves.