Eons ago, a rushing lava river formed this pristine passage through solid rock.

A reproduction of earth's many biomes.

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

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.

A unique gallery chronicles the losers of American presidential history.

An experimental, automotive replica of Stonehenge.

A natural rock formation believed to be a cure-all.

A museum and apothecary garden devoted to the history of frontier medicine.

This unusually circular centenarian barn became a Route 66 icon.

The modest childhood home where the baseball legend and Yankees star learned to hit from both sides of the plate.

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

No matter what the plaque under this massive legume says, this is not the world's largest peanut.

One of the best examples of Art Deco architecture in the United States.

Over 50 historic windmills whir away at this outdoor museum.

This historic theater's pipe organ still accompanies silent films just like it did in 1929.

To honor his gardening wife, this yard artist turns bowling balls into playful, colorful sculptures.

The largest land animal skull ever discovered.

When you can afford only half a road, you build only half a road.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.