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

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

Colorado’s second largest natural lake was created by a landslide.

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

Unlike most arches, this geological oddity formed in a volcanic dike.

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

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

A picturesque (all-natural!) beach in a landlocked state.

Community owned and operated, this property is home to a diverse set of nudists.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

The former home of the "Manassa Mauler" is now a museum dedicated to his legendary boxing career.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

When this 160-year-old church was being built, a stonemason included a hidden homage to his late daughter.

A unique arch graces the Dolores River Canyon near the Hanging Flume.

This marker identifies the location where three states converge.

A prehistoric rock shelter that's literally in someone's backyard.

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

A fake mine that was made using real mining techniques which is also used as a community center.

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