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

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

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

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

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

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

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

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

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

A glittering Thai Buddhist temple in suburban Pennsylvania.

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

A field of nothing but boulders which resembles a giant's gravel driveway.

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

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

Behold the rickety wooden glory of the world's oldest operating roller coaster.

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

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

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 local prank turned town icon.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

Pennsylvania's own Roswell-style UFO mystery.