This unassuming layer of clay boasts an out-of-this-world origin story.

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

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.

A statue high in a hill that represents how Buffalo Bill got his name.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.

The highest point in Washington state is a volcano covered in glaciers.

Once the largest town in eastern Yuba County now sits abandoned.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

An alley covered with 20 years of bubble gum.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Cambria's most unique B&B features creative surroundings and fantastic food.

A house built from trash known as the poor man's Hearst Castle.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Marta Becket's hand-painted theater in the desert.

A mysterious and endangered parasitic herb from the California desert.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

One of the most unusual geological features, recognizable from a dozen hit movies.

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.