This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This massive roadside mascot was the first version of the giant to illustrate his butt.

The final resting place of a space program monolith.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Three hundred years of preserved Spanish colonial history in San Antonio.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Time travel with sweets across history at this research-based candy store.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The last SR-71 ever constructed.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

A real flying saucer, contracted by the U.S. Air Force.