An abandoned relic of the city's failed experiment with below ground transit.

The remnants of an early American attempt at missile defense.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A crumbling hospital from the 1850s on Roosevelt Island.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

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

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.

This amazingly preserved Gold Rush town is a historian's dream.

This abandoned prison castle has become an imposing gallery of graffiti art.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

A Beaux-Arts triumph set to become Ford's innovation campus

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

During the 1990's nearly all of the world's LSD is thought to have come from the operators of the lab once located in this missile silo.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

If astronomy had a ghost, it would look like this observatory.

This remote island in Iowa was abandoned after being devastated by flood.

See just what life was like in a 19th-century prospecting town.

This former luxury resort in Kaua'i is now an abandoned relic.

The beauty of urban decay, hiding some dark secrets.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.