An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

The singular ruins of a mysterious lost city.

This underwater old Texas hill town only resurfaces during harsh drought.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

The world’s largest underground marble quarry is hiding in Vermont.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

A former copper mine which became a truly unsuccessful prison.

A mysterious "wedding cake" castle in the middle of the urban desert.

A medieval castle in the middle of rural Texas.

European castle ruins in an American state park are actually the product of death and grief.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

This island castle contains enough secret passageways to support a season of Scooby-Doo episodes.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

An abandoned castle owned and ignored by Masons carries a cursed history.

Former villa and estate of James Deering developed to preserve native tropical forests.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

These mansions date back to Chicago's days as a brewer's paradise.