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

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

This icon of the Atomic Age now lays dormant.

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

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

A daily replay of the experiment that proved the rotation of the Earth.

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

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

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

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

Journey through a collection of over 35,000 Halloween items from all generations.

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

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

These disused steel furnaces are now haunting ruins that may one day be a national park.

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

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

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

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

The ruined remains of a coal mining ghost town are hidden within the woods.

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

There aren't too many operational funiculars around, but Pittsburgh has two!

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

This Old Testament garden features 100 plants from biblical times.