The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Water of undetermined depth has attracted rare fish and cult leaders alike.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An artificial crater field that trained astronauts for lunar exploration.

The cinder cone volcano with a less than complimentary name.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This museum offers an actual time machine back through Colorado's past.

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

Bonsai garden in Oakland is curated by the first non-Japanese female bonsai master in the United States.

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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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

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

This massive home was constructed by one of the greatest conservationists in Colorado history.

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

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

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

The largest source of fossilized insects anywhere.