A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

Pyramid home to an obscure religious group that practices modern mummification.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

The last SR-71 ever constructed.

This pristine World War II airfield gives a comprehensive look at atomic development and aviation history.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

This creepy, abandoned cemetery is all that remains of a once booming mining town.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

An unprepossessing storage reservoir in southern Utah has a checkered past.

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

Jurassic Park—A Still Life.

This softball diamond has a culture all its own.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

The largest island on the great salt lake is home to curious creatures and strange stories.