Built 1,500 years ago, this abandoned Mesoamerican city is surrounded by a natural wall made of outstanding rock formations.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

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

A unusual sanctuary for abused and exotic animals in South Jersey.

A recently abandoned psych ward at the end of Sanatorium Road.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Series of storm drains connected to a dark urban legend.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

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

A storefront museum in Asbury Park honoring the Jersey Shore’s deep history of mystery—including the Jersey Devil.

Penn State's giant bug collection.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

In which a local geological marvel becomes a quaint roadside attraction.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.