A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

A Mars simulation in the southern Utah desert.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Oddly shaped rock formation, misassociated with a nearby utopian community.

A river runs through this remote valley in a very unexpected way.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Dramatic river bend surrounds a natural red-rocked pedestal.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This quiet park's strange sedimentary spires were named after Kodak's color film.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

The fifth-longest natural arch in the world, and the longest outside China.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

Visitors to this library are in for a real-world education in modernist architecture.