How did a massive marine arthropod find its way to landlocked Ohio?

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

See the nearly two-century-old ruins of pre-railroad America at the former site of a lock on the Ohio and Erie Canal.

The largest earthwork effigy in the world.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

This might just be the TARDIS of bookstores.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

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

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Century-old shop, specializing in Occult products.

Step into a pastel time capsule where candy is truly dandy.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

The first partially complete dinosaur skeleton was discovered here, forever changing the world's view of the ruling reptiles.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

The remains of a failed subway in upstate New York is now an underground graffiti bunker.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

The first American department store, and home to the largest operating musical instrument in the world.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.