Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

This hot dog-shaped diner has moved all around Colorado, but has never been to New York.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

A 200-year-old collection of oddities and medical paraphernalia.

What happens when a sculptor has to find a way around a 100-year-old copyright.

Nature took her revenge on the "Wickedest City in the World."

A 40-foot waterfall flows into this unique natural swimming hole.

A version of this picturesque mill has existed since the 1800s.

Often referred to as the largest spring in America.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

This small turbine mill along Rocky Creek was built in 1928

The only remaining historic maritime signal station in the United States.

A nature and outdoor art preserve features the large-scale, abstract works of a renowned Maine folk artist.

One of the deepest springs in Missouri.

It's as if the herds walked straight out of a fairy tale into the Missouri wilds.

Where the author wrote her beloved "Little House" books.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

The largest outdoor art gallery in the Northwest United States.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Home to fossils and other specimens from the Western Interior Seaway.