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

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

This cast-iron canine is a beloved icon among the people of Johnstown and ice hockey fans everywhere.

Steepest flood safety railway in the entire world.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

Step inside Lucy, the world's largest "elephant."

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

A historic dam made famous for its turbines and feature in a Hollywood classic.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

148 feet long and in the middle of a verdant forest.