Narrow gorges and deep pools created by long-ago glaciers.

Locals call this magical moss-covered walkway the "Emerald Path."

This semi-spooky remnant of an abandoned hotel provides fantastic views.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

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

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

Where America's first doomsday cult awaited the end of the world.

This public space is speckled with the eerie remnants of a defunct amusement park.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

The abandoned coal loading dock is a canvas for unsanctioned art.

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

A hidden alley in urban Baltimore is a haven for graffiti artists.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

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

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

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

An underground blaze turned this village into a ghost town.

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

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.