Water of undetermined depth has attracted rare fish and cult leaders alike.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This unique art installation used boiler tubes from a decommissioned power plant to resemble Antelope Canyon.

Between 1930 and 1946, a tobacco farmer laid his beloved horses and mules to rest in this small patch of pine forest.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

America's only nuclear missile silo open to the public.

This church on a Tohono O'Odham reservation has stood since 1797.

This bomb shelter-themed bar has barely changed since it opened.

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

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

A reproduction of earth's many biomes.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

This historic pink parlor keeps Phoenicians cool with homemade, retro ice creams.

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

Rippling sand dunes frozen in the Arizona rock.

This small, unassuming street is now a canvas for color and creativity.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

An out of this world experience.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

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