An abandoned quicksilver mining town surrounded by the Big Bend parks.

Abandoned concert venue legendary for its rock counterculture.

Abandoned silver mine strewn with wrecked and twisted structures.

The remnants of an early American attempt at missile defense.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

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

An homage to everyone's favorite prehistoric cartoon family.

Remnants of a storybook amusement park hidden behind a strip mall.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

The bones of an old zoo crumbling in the shadow of a new one.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

An urban forest overtakes what was the greatest failure of utopic urban housing.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.