This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.

Some of the oldest exposed rock formations in the United States.

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

A large wave-cut shelter, a major archeological site, overlooks the dry basin of Winnemucca Lake.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Colorado's only active volcano last erupted around 4,000 years ago.

Saved by a logger, this Douglas fir is one of the last great old-growth trees in Canada.

Standing 191 feet tall and measuring more than 55 feet in circumference, this is the world's tallest spruce tree.

Rustic natural hot springs in the deciduous rain forest.

Stroll through a wonderland of stupendous moss-covered trees.

In one of the hottest parts of the Mojave Desert, shallow bedrock forces the typically dry Mojave River to the surface in this canyon, providing a vital oasis for humans and wildlife.

This sun-scorched lakebed contains samples of half the natural elements known to humankind.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Quite simply the largest tree in the world (by volume).

Four hundred granite steps were built into this massive rock by the National Park Service.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Deep vertical fissures like miniature slot canyons cut across the cemented volcanic rock of Black Point above Mono Lake.

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

A volcanic cone that formed over 600 years ago.

Towering basalt columns, a creation of fire and ice.

A natural dome made of volcanic glass in Inyo National Forest.