An occult-y, historic hotel with the World's Largest Ouija board on the roof.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

A priceless collection of the Nation's cryptologic history.

Bizarre Cavern.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

Pennsylvanian mass grave and possibly mass murder.

It would take 35 firetrucks to fill this enormous glacial pothole.

America's first serial killer rests in anonymity.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

This park contains a number of standing stones meant to heal and inspire.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

The graffitied ruins stand hidden within the Pennsylvania woods.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

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.

A beautiful oddities shop crammed with strange and morbid curiosities.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Mysterious rocks that ring musically when struck.