A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

The largest earthwork effigy in the world.

Rare recess caves fill this unbelievably beautiful Ohio park.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A sharp bend in a dramatic river canyon cut through red rocks.

This monument marks the point where Oklahoma, Kansas, and Missouri intersect.

This otherworldly church spire reaches up toward the heavens.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

Where the author wrote her beloved "Little House" books.

Curious cave that stays a cool 56 degrees all year long.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

An unusual geological feature towers over the remains of a dark episode in United States history.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

A devilishly named gorge that was a sign of salvation for many pioneers.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Miraculous tree that seems to sprout out of solid rock.

A popular rock that acted as a waymarker for American pioneers.