An underground wonderland in Iowa.

Hidden in the grounds of the Fort Dodge Museum is a "real" and terrifying petrified giant.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

It's safe—and permitted—to walk across these twin natural sandstone arches.

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

A small oasis not far from downtown Moab.

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

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

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

Despite its name, this route in southern Utah offers a heavenly day trip.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Come for the speed, leave in love with the desert.

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

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This geothermal hot spring hides beneath a slowly growing mineral dome.

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

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

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.