A memorial dedicated to the victims of the Columbine High School shootings.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

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

This highest peak in New Mexico is named after an explorer who had a habit of lending his moniker to peaks.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This black shoreline is made up of exploded lava particles.

Watch the newest land on the planet form before your eyes.

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

The oldest continuously occupied public building in the United States.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

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

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

A historic gristmill that still produces flour and grits the old-fashioned way.

Home to the deepest rift anywhere on Earth.

The largest island on the great salt lake is home to curious creatures and strange stories.

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

Take a monster truck tour around an ostrich farm in the middle of the desert.

The largest source of fossilized insects anywhere.