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

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This historic train station has been converted to a locomotive themed hotel.

This replica of the Greek structure is in the heart of Nashville.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

A massive sea stack famous for its appearance in The Goonies.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

20,000 pieces in a Frank Gehry-designed building.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The world's longest known cave system.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The site of Paul Revere's historic two lantern warning.