An obscure waterfall that looks like something out of a fantasy novel.

A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.

An extraordinary mixture of natural beauty and man-made phenomena.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

A Boeing mechanic and his wife leave a whimsical, stone sculptured garden as their legacy.

Rustic natural hot springs in the deciduous rain forest.

One of Japan's most famous sights, the bridge was originally built in 1673.

Stroll through a wonderland of stupendous moss-covered trees.

Shoreline strewn with the remains of ghostly fallen trees.

Only known mainland rookery of the threatened Stellar sea lion.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A vertically floating hemlock controls the waves and weather at Crater Lake.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Site of the greatest known waterfall that ever existed.

Rippling sand dunes frozen in the Arizona rock.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.