Rippling sand dunes frozen in the Arizona rock.

Take a monster truck tour around an ostrich farm in the middle of the desert.

An open-air, roadside eatery celebrating a historic indigenous cuisine of complicated significance.

A sinkhole known simply as "The Hole."

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

Where layer cakes tower above one’s head and there is never a shortage of icing.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This spot along the 23.5 degree north parallel marks the northern boundary of the tropics.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

This strange, small castle on the bayou has withstood the test of time and weather.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

This Art Deco airport was once deemed “the air hub of the Americas.”

The world-record holder for the longest bridge stretching continuously over water.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

Art Deco stylings conceal the true nature of this bridge.

A mesmerizing disco ball-like sculpture along the Sacramento River Walk.

The only standing town in the United States that early Chinese Americans built for themselves.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.