Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This cheery fruit farmer welcomes visitors to a classic roadside emporium.

This is one really big nut.

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.

Home of the International Space Hall of Fame.

Victorian "Fancy Craft" Hair Wreaths and Relics.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

Take a dip in the world's largest mineral hot springs pool.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

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

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The highest bridge in America was built for an almost unnervingly small amount of money.

The largest self-built castle in the U.S., six decades in the making.

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

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

Strange physical sensations and optical contradictions keep visitors coming back for more.

Miners in Michigan developed a taste for Cornish beef pasties, which this roadside stand has been selling since 1947.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

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

For more than 50 years, an iconic sign has greeted visiting “fudgies” to the Traverse City area.