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

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

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

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

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

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

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

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

A failed piece of Orientalism has become the proud symbol of a community.

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

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

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

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.

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

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

The graffitied ruins stand hidden within the Pennsylvania woods.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

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

This church in Pittsburgh is home to the largest collection of religious relics in North America.

This Old Testament garden features 100 plants from biblical times.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.