A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ancient pueblos built into the base of a natural canyon wall.

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

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

Outsider Art Community.

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

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

The stone circle honors the 19 firemen who perished during the Yarnell Hill Fire.

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

A self-built castle made by a mysterious man.

A geological mystery on Camelback Mountain.

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

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

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

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

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

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

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.

Vancouver's only resting place for the city's deceased.

The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

Five varieties of trees with custom-designed grates around the trunk are planted along the route of the Seattle Transit Tunnel.