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

Steepest flood safety railway in the entire world.

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

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

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

These lush botanical gardens employ the most purrfect pest control force.

The last street in Pittsburgh that's paved with wood.

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

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

Locals call this magical moss-covered walkway the "Emerald Path."

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

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

A local prank turned town icon.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Pennsylvanian mass grave and possibly mass murder.

An outlandish shoe shaped house built by an eccentric millionaire.

This secluded walking trail is a hidden gem of a Pittsburgh park.

This elaborate towering structure was once famed for its revolutionary height.

It would take 35 firetrucks to fill this enormous glacial pothole.

The Home and murder site of the witch of Rehmeyers Hollow.