It leads to a former hospital’s old root cellar.

This enchanting forest trail leads to ethereal abodes and a giant bird's nest.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Introducing the Green Fairy to her fawning masses.

Site of a former hidden treehouse in New Orleans.

An abandoned underground bunker not far from downtown New Orleans.

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

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

This historic hub for labor unions has survived the city's changing landscape.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.

Ornate and macabre headstone in one of the country's oldest cemeteries.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

Trash escaped from a landfill to fill beaches with all kinds of treasure.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

Friction between grains of sand cause a curious "singing" sound.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

This old steel industry company town has a tradition of parking cars on the sidewalk so people can walk in the narrow streets.

Paranormal activity on the great lakes.

305 homemade stone stairs wind their way up the Hamilton escarpment.

Whimsical sculptures dot a woodland path surrounding their creator's old summer cottage.