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

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

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

Steepest flood safety railway in the entire world.

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

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

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

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

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

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

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

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

Pennsylvania's own Roswell-style UFO mystery.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

This park contains a number of standing stones meant to heal and inspire.

The oldest farmer's market in America is so ancient it was approved by the King of England.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A failed piece of Orientalism has become the proud symbol of a community.

This Old Testament garden features 100 plants from biblical times.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.