A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

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

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

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

A rare view of a preserved Victorian science museum.

A toxic ghost town sitting atop a massive coal fire.

Memorializing an American tragedy of massive proportions.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

A museum of anything and everything Stooge.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

A daily replay of the experiment that proved the rotation of the Earth.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

This jail which was in service for over a century is now open for curious visitors.

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

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

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.

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

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