The first American department store, and home to the largest operating musical instrument in the world.

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

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

The site of one of history's most indelible and horrific tragedies.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

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

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

No one knows who painted this mysterious mural in a Penn State basement.

Penn State's giant bug collection.

This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

This rare polygonal meeting house is rumored to be built in a circle so that the devil has nowhere to hide.

Dispersed across 45-acres, 39 structures house a massive collection celebrating American Folk Art.

A giant toy jack made of numerous welded-together fire hydrants.

Cryptid lake monster honored with its own monument.

Scary metal statues adorn some of the signature buildings of Burlington, VT.