Aspen's User Profile - Atlas Obscura
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Yellowstone National Park, Wyoming

Sheepeater Cliff

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.
Cameron, Montana

Earthquake Lake

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.
Yellowstone National Park, Wyoming

Isa Lake

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.
Yellowstone National Park, Wyoming

Grand Prismatic Spring

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

Old Faithful Geyser

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

The Hemingway Memorial

Tucked away on a scenic trail, a modest memorial honors one of the greatest writers of our time.
Arco, Idaho

Craters of the Moon National Monument and Preserve

Home to the deepest rift anywhere on Earth.
Kimberly, Idaho

Shoshone Falls

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.
Sequoia National Park, California

General Sherman

Quite simply the largest tree in the world (by volume).
Borrego Springs, California

Fonts Point

A remote desert lookout offers unparalleled views of the California badlands for those who brave the trek.
Ajo, Arizona

Quitobaquito Springs

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.
Ajo, Arizona

Arch Canyon Trail

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.
Roosevelt, Arizona

Tonto National Monument Upper Cliff Dwelling

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.
Green Valley, Arizona

I-19, America's Only Metric Interstate

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.
Tucson, Arizona

Gordon Hirabayashi Campground

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.
Benson, Arizona

Kartchner Caverns

Limestone caves with spectacular showcase chambers.
Willcox, Arizona

Heart of the Rocks Loop

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.
Bowie, Arizona

Fort Bowie National Historic Site

The former home of the army detachment that captured Geronimo.
Morenci, Arizona

Morenci Mine

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.
Clifton, Arizona

Clifton Cliff Jail

This Old West prison built into the side of a cliff was said to be inescapable.
Holbrook, Arizona

Petrified Forest National Park

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

The Narrows

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.
Brian Head, Utah

Cedar Breaks National Monument

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.
Oatman, Arizona

Oatman

This once-booming Gold Rush town is now home to a herd of feral donkeys.