A human attendant once directed car traffic from this structure before automated stoplights.

Gorgeous cave resemble a winter wonderland.

The ghostly remains of what was once the world's richest copper mine.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

First LEED-certified gas station in the United States.

Steep canyon walls hide a forested oasis in the West Texas desert.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

See just what life was like in a 19th-century prospecting town.

Legend says that these tall basalt pillars are the petrified wives of a trickster god.

Lighthouse-cum-columbarium where "Nor'easters" and grandma go to die.

This rustic cabin, outfitted with gun slits, was once home to John D. Tewksbury, patriarch of the bloodiest family feud in American history.

A retro walk through the history of the tube.

The only road through the heart of Glacier National Park.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

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

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

The smallest country in the world.

The abandoned coal loading dock is a canvas for unsanctioned art.

A vertically floating hemlock controls the waves and weather at Crater Lake.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."