Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

One of ancient Etruria's most spectacular archaeological sites with impressive necropolises and rugged landscape.

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

This castle played host to the largest great hall found in medieval Central Europe.

Abandoned in 2009, this once popular resort destination now stands frozen in time.

This lesser-known leaning tower is all that remains of the medieval castle of Vernazzano.

This temple was constructed entirely by Roman soldiers.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

A devilishly named gorge that was a sign of salvation for many pioneers.

Existing for more than four centuries, the last of Hakone’s historic teahouses serves a sweet, mold-based rice drink.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A former reservoir that was only recently discovered after more than 60 years of disuse.

The spot where Parvati convinced Shiva to marry her, has become a pilgrimage site for married and unmarried women.

The forgotten remnants of a land-to-sea cable car that was once unique in the world.

What appears to be an ancient Roman temple is actually a Catholic church.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This medieval "painted village" is famous for its geometric facades.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

This ruined Japanese stripclub sits half burnt to the ground.

The ruins of Japan’s premier water brothel.