This natural marble cave is one of only five national monuments in Oregon.

A sculpture of a salmon swimming through a brick building.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.

A bronze replica of half-consumed salt lick honors a quirky town tradition.

The largest outdoor art gallery in the Northwest United States.

The final resting spot of the Colorado Transportation Department's beloved unofficial mascot.

An experimental, automotive replica of Stonehenge.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

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

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

A Mars simulation in the southern Utah desert.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

One of the largest trees of its kind in California.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.