Venice's "Island of the Mad."

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

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

Forgotten German bunkers in China create a sharp cultural contrast.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The loneliest island in New York.

A canvas of crops grow from vibrant red soil in this terraced farmland.

This abandoned naval battery stood at the ready as recently as the 1980s.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

The world's most remote memorial to the victims of the UTA Flight 772 disaster.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

A submerged village appears when dam levels drop.

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

Secret North Korean passage discovered below the world's most dangerous border.

The unique ecosystem atop an Australian mountain is home to some colorful inhabitants.

An ethereal glowing blue ocean cave in Croatia.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.

An ancient city exhumed from the depths of the ocean.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

The world's largest collection of witchcraft regalia.