The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

This giant disembodied horse head seems to balance impossibly on its nose.

A museum of anything and everything Stooge.

Pittsburgh's literal underground railroad.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This dramatic rail curve was once the target of a failed Nazi attack.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Steepest flood safety railway in the entire world.

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

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

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

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

Yo, Adrian!

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

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

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

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

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.