Nature took her revenge on the "Wickedest City in the World."

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

Remains of military submarines built in secret jungle factories by the Tamil guerrillas' naval wing.

The world's only underwater laboratory where "aquanauts" study oceanic life.

A part of the world's largest marsh seems to be growing bright red Martian grass.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

One woman's dream became a train hotel in her backyard.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

A completely underwater art museum sends a stark message about humans' impact on the environment.

The struggle of a small Dutch island against the sea.

This small electronics museum is full of whirring, humming, clicking ephemera.

Take a walk in a recreation of ancient Rome.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This miniature take on the Kremlin is one Dutch man's retirement project.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

The last bastion of Roman presence north of the Alps looms over a German town.

This Scottish burial tomb once held hundreds of ancient eagle bones.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.