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

A multi-storied adobe complex has been inhabited for more than a thousand years.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

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

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

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

An oil baron's wild paradise and the winner of an ill-fated air race.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Community bookshelf of 25-foot-tall book spines.

World's tallest monolithic statue has served as a pilgrimage site since its completion in 993 CE.

Modest by day, illuminated majestically at sunset.

An ancient iron pillar in Delhi that seems to be rustproof.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The world's second-largest sundial, made entirely out of stone.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's longest known cave system.

More than 5,000 contemporary and "historic" mustards from around the world.

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

A building so large that it has its own weather.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

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