This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

A monument to a survivor of harsh pioneer life, frostbite, and primitive surgery.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

An important piece of history from mankind's journey to the moon sits in the lobby of a government science lab.

This unique competition celebrates an American Indian and Canadian First Nation cultural tradition.

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

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

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

The first permanent memorial to a unique secret weapon of World War II.

The shop's owner has spent decades in the desert wearing nothing but a strategically placed sock.

The biggest solar telescope in the world helps reveal the secrets of our sun.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

Miniature art that tells an enormous story.

A collection of huge, site-specific sculptures sitting in the Montana woods.

New fungal and bacterial species call this deadly lake home.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A popular rock that acted as a waymarker for American pioneers.

An architect's childhood fantasy treehouse made real.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.