The highest point in Washington state is a volcano covered in glaciers.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

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

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

Perhaps the world's only gas station inspired by a political scandal.

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

The unusual burial monument of Arizona's first governor.

A geological mystery on Camelback Mountain.

An urban laboratory.

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

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A spiritual vortex among the red rocks in Sedona.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

This tiny lake temple dedicated to a water goddess seems to float on the surface.

The underground hideout of a Japanese soldier for whom World War II ended in 1972.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.