This scenic spot is known as the birthplace of Switzerland.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

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

Considered by many to be a local landmark and treasure.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

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

Penn State's giant bug collection.

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

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

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

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

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

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

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

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

Where the Millerites gathered to watch the end of the world in 1844—and left disappointed.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

Across from a hotel parking lot, a Confederate spy rests under a large tombstone with her Union Veteran husband behind a copse of trees in a small, well-maintained cemetery.

The birthplace of the Herndon Gas Company.

The site of an early Arthurian battle and the dwelling-place of prehistoric people and (possibly) an ancient race of giants.

A giant roundabout made up of six smaller roundabouts can befuddle the uninitiated.

Watch the seas clash at the place where according to Maori tradition, the spirits depart for their journey to the afterlife.

Mounds of fine golden sand that can rise nearly 500 feet tall.