Rippling sand dunes frozen in the Arizona rock.

This replica of the Greek structure is in the heart of Nashville.

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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

Rustic natural hot springs in the deciduous rain forest.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This frequently-photographed waterfall takes only a short hike to visit.

A beautiful geyser under environmental threat.

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.

The first declared National Monument in the United States.

Stroll through a wonderland of stupendous moss-covered trees.

The United States Capitol's former columns still stand.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

The Grand Canyon of Texas.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

The haunting ruins of Jack London's dream house.

San Diego's most historic and haunted home.

This massive redwood tree has a hole in the base big enough to drive through.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Abandoned bridge hidden deep in the San Gabriel Mountains.