A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A self-built castle made by a mysterious man.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

The ghostly remains of an accidental sea.

This stately structure has been abandoned for half a century.

This California tree is the single source of the state's entire orange industry.

Famous and forgotten figures lie beneath the faded headstones and decaying planks of wood.

These unusual houses look like giant boats that washed ashore on a residential street.

This large collection of tiny things revels in the art of fine machinery well made.

This historic tower in the California desert promises visitors a "vortex of good vibes".

A UFO scrapyard in the California desert.

Where NASA's satellites and rovers phone home.

This sculpture garden in Death Valley makes you feel like you've slipped into some alternate reality.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

A "haunted" landmark on the coast of Southern California.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

The world’s largest concentrated solar plant generates as many problems as megawatts.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

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