Pennsylvanian mass grave and possibly mass murder.

These disused steel furnaces are now haunting ruins that may one day be a national park.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

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

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

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

There aren't too many operational funiculars around, but Pittsburgh has two!

The ruined remains of a coal mining ghost town are hidden within the woods.

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.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

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

In the early 1800s, surgery was also a show.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The graffitied ruins stand hidden within the Pennsylvania woods.

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.

Dr Barnes' $25 billion private collection of art and arboretum.

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

This might just be the TARDIS of bookstores.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

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

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