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

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

The first declared National Monument in the United States.

One man's ambition created this psychedelic log home.

At the time of its completion, it was the tallest dam in the world.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Art Deco stylings conceal the true nature of this bridge.

An iconic 1960s theater with a Buckminster Fuller-style geodesic dome.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

A multi-storied adobe complex has been inhabited for more than a thousand years.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This sparsely populated town offers a look back in time.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

"I did this all while you were watching TV."

Three hundred years of preserved Spanish colonial history in San Antonio.

Belly up to the bar in Cowtown, don't forget to buy some boots.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

The 17th-century hacienda where Simón Bolívar spent his last days before dying from tuberculosis.

Come for the springs; stay for the mud bath.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

Built in 1512, the oldest cathedral in the Americas.

After Christopher Columbus died, his son built a fancy house to rule from.