Mining town from the late 1890s, once home to Calamity Jane.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

Odd outsider art installations surround a Gold Rush-era ghost town.

A brothel nestled amongst ghost towns, with an abandoned plane wreck to greet you.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A few dilapidated structures are all that remain of this deserted former silver mining town.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

The first hospital in the New World.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A formerly abandoned mental institute, now back in business.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

This mouldering abandoned mental hospital was once a center for progressive healing.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.