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

This Wyoming town is fascinated by a particular mythical creature.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

Every president in history is immortalized in bronze in downtown Rapid City.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

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

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.