The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Eighty million natural history specimens call this gargantuan museum home.

A kaleidoscopic warehouse-maze of handmade neon signs.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

These fantastically named natural pools look like something out of a Scottish myth.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

Resting place of Hollywood's immortals is also site of summer film screenings.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The site of a tragic massacre that spawned a multimedia franchise.

The hidden jewel of Disneyland: a members only playground for the Disney elite.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

An isolated dive site teeming with cnidarians.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.