Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

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

The largest source of fossilized insects anywhere.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

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

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

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

When ecosystems collide in the arid Southwest.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A striking 12th-century-style castle built on the edge of a cliff.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

This super steep hike ascends 2,000 feet in less than a mile.

This enigmatic building features numerous architectural styles.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Curtiss is a forgotten figure in the early history of flight.

This mansion was made famous by its colorful cast of owners and location along the Sante Fe Trail.

This quaint museum lets you take a ride on its antique carousels.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Victorian "Fancy Craft" Hair Wreaths and Relics.

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