While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

An overlooked memorial honoring the local Washington residents who died in World War I.

The only female equestrian statue in Washington, D.C. is a 15th-century French heroine.

An industrial waste tourist attraction.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Explore this unspoiled peninsula with 11 sandy beaches and 13 miles of hiking and biking trails (keep an eye out for soaring bald eagles overhead).

Climb the first lighthouse commissioned on a Great Lake to a lookout with peaceful, panoramic views.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

Where the oil industry began.

A beautiful hidden gem in central West Virginia.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

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

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

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

This Civil War monument was designed by an eccentric architect and Gettysburg veteran.

Catch these free-to-view artworks that span centuries in this Central Pennsylvania museum.

There are many ways to enjoy this old-growth forest and its views.

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

Hear the roar of the engines and the crowd at this nearly 90-year-old Pennsylvania track.

Descend into a subterranean labyrinth of geologic wonder and local lore.

Memorializing an American tragedy of massive proportions.