This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

The state's only comprehensive museum dedicated to the mineral that defined its history and economy.

Millions of years of erosion created the feature for which this rock formation is aptly named.

Once a year, at exactly 11:11 a.m., this monument comes to life.

A geological mystery on Camelback Mountain.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The unusual burial monument of Arizona's first governor.

These free-roaming horses were once destined to disappear from the land.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

In 1847, Brigham Young climbed this hill to survey the Salt Lake Valley and saw a fine place to build a city.

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

In 1952, this restaurant began selling the Colonel's “secret” recipe.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

Despite sitting firmly in the global cradle of the Church of Jesus Christ of Latter-day Saints, this Hare Krishna temple is host to one of the largest color festivals outside India.

This large, castle-like structure is hidden amid the mountains on the grounds of the Utah State Hospital.

Home to the only outdoor municipal elevator in the United States.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This sandstone mansion was the home of two of Oregon's most important pioneers.

10,000 flowered plants bloom in the City of Roses.

"I did this all while you were watching TV."

From a T-rex to a teapot, a cast of artificial fossils illustrates New Mexico's history.

The largest self-built castle in the U.S., six decades in the making.