These boots are made for selfies.

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

Crumbling hotel echoes with the sounds of the '30s.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

This Texas home and garden was the masterpiece of a British portrait painter.

The longest floating boardwalk in the United States.

A modernist landscape of water and sci-fi concrete.

The man who wasn't there.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

This erect, phallic geological spire wasn't always named so domestically.

The first declared National Monument in the United States.

The shortest river in America flows for just 201 feet.

Multiple monuments to a grizzled old mutt that survived the landscape of Butte's treacherous Berkeley Pit.

These giant metal horses graze on a hilltop near the Montana highway.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

An entire town preserved as a historic landmark.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

This town is home to the world’s largest arch constructed entirely of elk antlers.