Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

An emerald-green grotto just a short trip from Austin.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

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

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

The mysterious round rocks of Schooner Gulch.

An optical illusion found amid a logged redwood forest.

This corn maze so big you may want to pack a lunch, and possibly a flaregun.

The largest drain hole in the world.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The haunting ruins of Jack London's dream house.

340 bicycles, 65 feet high.