One of the ghostly stops along Route 66.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Four hundred granite steps were built into this massive rock by the National Park Service.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

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

A remote crossroads honoring a fallen talent.

A dwindling menagerie of anthropomorphic oil derrick animals still dot the barren California landscape.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

Come for the speed, leave in love with the desert.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A house carved into a rock in the 1940s.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Dig for your own trilobites in this goldmine of invertebrates.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

The world's largest military aircraft cemetery.

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

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.