This rustic old building is said to be the most photographed barn in America.

The longest living non-clonal organisms on Earth.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

Oddly shaped rock formation, misassociated with a nearby utopian community.

A house carved into a rock in the 1940s.

A small oasis not far from downtown Moab.

The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A toxic ghost town sitting atop a massive coal fire.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

Three prestigious academic collections come together to create a world-class natural history museum.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.