This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Colorful boxes placed over the dead are left to rot and crumble.

Four-story concrete hotel never opened to customers.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Once the central jail for Los Angeles, this building housed inmates like Al Capone, those arrested from the Zoot Suit and Watts Riots, and individuals imprisoned for their sexuality.

Eight huge lanterns lining a city street can change color on command.

A picturesque example of brute-force engineering conquering nature.

While you're unlikely to find riches here these days, this remote mine is a time capsule of the Gold Rush era.

This ramshackle ghost town is comprised of mining-era buildings collected from around the region.

Explore the wide world of desert plants at this unique Palm Springs botanical garden.

Nationwide network of co-ownership underground catastrophe shelters.

A sparse, solitary sequoia still stands as a living tribute to the famous conservationist who planted it—but it's dying.

This grand memorial remembers the 20 members of the Los Angeles Times killed when the office was bombed.

Gouged in the mountain to make stage coach access easier through the Fremont Pass.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

Beach instrument turned bed and breakfast.

A gargantuan crystal kingdom.

The mummies of a fake priest and bandit's wife are among the abundant curiosities at this museum.

The spectacular subterranean collection includes dazzling minerals, including a piece of "kryptonite."

You can explore the halls of tombs in the abandoned former capital of the Zapotecs.

History is on display in this hall, which has served as the seat of city government for centuries.