This bone-filled cave got its name after they found 140 bear skeletons inside.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

Villas that once served as playgrounds for the rich now fall away in decay.

London's Victorian Tower of Babel.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Rome's ancient Etruscan rival, now a park full of ruins.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

Fifty years of contamination in Scotland's waters.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The last woman executed for witchcraft in Europe is remembered in this Swiss museum.

Two thirds of this Montreal neon icon has survived to flash another day.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

The largest whale museum in Europe allows visitors to walk among life-size giants.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.