Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A geological mystery on Camelback Mountain.

A museum and tribute to a brave profession.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

These free-roaming horses were once destined to disappear from the land.

Don't blink or you'll miss it.

The eroded core of an ancient volcano is now accessible by a short hike.

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

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This erect, phallic geological spire wasn't always named so domestically.

Features unique photographic collections by women of the American West and historical attractions such as a two-story outhouse.

One man's quest for the ultimate road trip vehicle.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

The ghost town that ended up on Ebay.

The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The fifth-longest natural arch in the world, and the longest outside China.

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