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

The oldest surviving botanic garden in the United States.

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

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

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

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

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

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

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

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

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

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.

A rare view of a preserved Victorian science museum.

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

A toxic ghost town sitting atop a massive coal fire.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

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