The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

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

A toxic ghost town sitting atop a massive coal fire.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The ghostly remains of an accidental sea.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A 140-year-old castle with underground caves hidden in San Francisco.

A psychedelic labyrinth on the San Francisco bay.

World's first "penitentiary," meant to be humane, drove men insane.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.