This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Mysterious rocks that ring musically when struck.

A toxic ghost town sitting atop a massive coal fire.

The world’s first penitentiary, meant to be humane, drove men insane.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

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

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

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

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

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

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

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.

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

When ecosystems collide in the arid Southwest.

This beloved marketplace mascot poops money and grants good luck.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This elaborate towering structure was once famed for its revolutionary height.