A toxic ghost town sitting atop a massive coal fire.

A layered tribute to the work of mosaicist Isaiah Zagar.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

This icon of the Atomic Age now lays dormant.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

The site of America's first commercial oil well essentially disappeared after the town went bust.

A miniature golf course crafted inside the world's largest simulated cave.

Nothing says indulgence like a 1,500-pound chocolate castle.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

Penn State's giant bug collection.

Memorializing an American tragedy of massive proportions.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

A retrofuturistic art installation in the Pittsburgh Airport.

A museum of anything and everything Stooge.

This giant disembodied horse head seems to balance impossibly on its nose.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.