North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

The oldest surviving botanic garden in the United States.

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

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

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 elaborate towering structure was once famed for its revolutionary height.

A local prank turned town icon.

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

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

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

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

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

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

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

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

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

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

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

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

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.