A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

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

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

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

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

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

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Mysterious rocks that ring musically when struck.

A toxic ghost town sitting atop a massive coal fire.

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

Pittsburgh's literal underground railroad.

Hundreds of protractors affixed to surfaces all over the city.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

A unique workspace where offices reside on pirate ships and inside gingerbread houses.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

This icon of the Atomic Age now lays dormant.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.