Acres of natural wonders left behind by a socialite-turned-gardener.

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

A hidden subterranean installation offers a view of the sky.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A wunderkammer hidden on the top floor of the Hartford statehouse.

This home is decked out like a psychedelic explosion of colors and bowling balls.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Furniture tries to escape an abandoned building in San Francisco.

An ancient Viking village in North America that predates Columbus by 500 years.

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

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

A Saint Nicholas-themed ghost town in the Mojave desert.

A museum dedicated to exhibiting remarkable outsider art.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

This museum houses an imposing skeleton army comprised of creatures great and small.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Banksy gives themself artistic license with this piece of London street art.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The atmospheric road was never meant to be so creepy.