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

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

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.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

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

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

Mysterious rocks that ring musically when struck.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The oldest surviving botanic garden in the United States.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

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.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A curious building honoring past and current members of a historic musical comedy troupe.

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

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.