Long hidden under grime, the politically radical murals of a little known Yugoslavian master are finally getting their due.

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

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

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

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.

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

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

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

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.

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

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.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

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

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

An outlandish shoe shaped house built by an eccentric millionaire.

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

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

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

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