The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

A house carved into a rock in the 1940s.

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

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

Haunting and beautiful trees, doomed to die.

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

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

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

The cinder cone volcano with a less than complimentary name.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Ancient pueblos built into the base of a natural canyon wall.

This historic national park is covered in the stunning ruins of red rock pueblos.

A historic landmark and museum filled with curious objects representing the history of Key West.

The museum chronicling a treasure hunter's dream, fulfilled.