Naours, France
Cité souterraine de Naours (Underground City of Naours)
A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.
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Places on this traveler's wishlist.
Naours, France
A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.
Maidstone, England
This oak sculpture at the edge of a small woodland is nine feet tall and shrouded in mystery.
Council Bluffs, Iowa
The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.
Ali Sadr, Iran
This vast, water-filled underground labyrinth can only be toured by boat.
Masuleh, Iran
In this tiny Iranian town playing on the roof isn't just encouraged, it's the only place to go.
Orost, Iran
Iran's colorful terraces are a rare geological masterpiece.
Tehran, Iran
This circular Iranian jail was once a political prison run by the country's secret police.
Nice, France
The construction of a tram line unveiled hidden remnants of the old medieval city.
Washington, D.C.
A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.
Segovia, Spain
One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'
Nashtifan, Iran
The vertical-axis windmills of ancient Persia have been grinding flour for 1,000 years and counting.
New York, New York
The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.
Paris, France
A subterranean shelter remains intact under a busy Paris railway station.
Pniewo, Poland
What was once an underground Nazi city is now Europe's largest bat reserve.
Arques, France
This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.
Nushabad, Iran
A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.
Berlin, Germany
A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.
Ongar, England
This historic franken-chapel is the oldest wooden church in the world, at least part of it.
Heuvelland, Belgium
A Cold War command center is hidden under an idyllic countryside.
Tel Aviv-Yafo, Israel
The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.
Dochula, Bhutan
The small sanctuaries lie just off the beaten path near one of Bhutan's most famous attractions.
Da Nang, Vietnam
This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.
Portugal
A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.
Vienna, Austria
A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.