Once home to a thriving oil industry, this town now sits eerily abandoned.

Over time, this castle grew to encompass the entire island.

This popular pitstop lives up to its name.

The remnants of an early American attempt at missile defense.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

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

The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

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

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

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.

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

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

Abandoned silver mine strewn with wrecked and twisted structures.

A Saint Nicholas-themed ghost town in the Mojave desert.

Four-story concrete hotel never opened to customers.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

This desert oddity hides in plain sight thanks to a cartographic error and a desert explorer with a punny sense of humor.

A remarkably opulent mansion with a tragic history.

A historic observatory precariously perched at the "Top of Europe."

This reconstructed Norman castle is the world's most accurate, from location to livestock.

Located in a remote part of a Louisiana wildlife refuge, this tree has been standing for more than 1,200 years.

Ado Awaye Mountain and the unique lake that sits near its peak are shrouded in ancient legends.