These disused steel furnaces are now haunting ruins that may one day be a national park.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

This winding road through an Italian canyon may be the most scenic drive in the world.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

New York City's only preserved family home from the 19th century.

The last orange grove of the San Fernando Valley is owned and protected by CSU Northridge.

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Hidden beneath a lake for decades, this brutalist mine has now emerged from beneath the receding waters.

Pirates had to be ousted from the land where this now ruined Louisiana fortress was built.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

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

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

The remains of this ornate chapel now act as a portal to a cramped French cemetery.

Eighty million natural history specimens call this gargantuan museum home.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This simple highway curve has become a comedic pilgrimage site.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A snapshot of the city's fascinating voodoo culture.

A former utopian healing center created by a huckster and built by derelicts.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.