A hidden subterranean installation offers a view of the sky.

When ecosystems collide in the arid Southwest.

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

A museum dedicated to exhibiting remarkable outsider art.

Museum dedicated to awful artwork.

A 300-ship graveyard, with a few still visible at low tide.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

This free, take-a-book shop seems like a trick but isn't.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A storybook European village in Berkeley.

The largest drain hole in the world.

A wall of chewing gum moonlights as collective art.

See massive fossils that are over 200 million years old in northeastern Arizona.

Visible below the waves are memorials to the city's Gold Rush dead.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

An essential stop before plundering, BYO Cutlass.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.