One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The Uros people live on floating reed islands in lake Titicaca.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

Travelers exchange letters with woodland creatures at this mini post office.

Queen of the waterlilies, so big and strong it can support the weight of a human.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This lab's maddening silence is good for business but bad for sanity.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

Forgotten German bunkers in China create a sharp cultural contrast.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

This former shopping center now acts as the eccentric lair of the Venezuelan secret police and their shadow prison.

This picturesque mansion has gone from opulent ruin to nature museum.

This everlasting lightning storm may be the world's largest generator of ozone.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

One of the largest, oldest, darkest, quietest motel rooms in the world.

A swing to dangle you off the very edge.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

Mysterious 500-year-old tapestries depict a unicorn hunt.