This mysterious series of teeny guerrilla installations sheds a whimsical light on street art in Oakland.

Secret North Korean passage discovered below the world's most dangerous border.

The world's first cruise ship-shaped hotel is perched atop a cliff.

The darkest building on Earth was built for the snow-white scenery of the 2018 Winter Olympics.

Home to more than 13,000 pieces of war memorabilia and military equipment.

A chilling monument to Korean patriots who resisted the Japanese occupation.

A bright and wacky exhibit answers every question you may have had about human excrement, flatulence, and more.

Tracking the 1,500-year history of Korea's star cabbage.

A psychedelic labyrinth on the San Francisco bay.

This eagle-topped spire remembers the military commander who snatched up California for the United States.

The stately birthplace of California's statehood.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

A tree grown from astronaut seeds which were exposed to cosmic rays.

The first safe in this California town had to hold all the gold.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

The oldest continuously operating church in California.

This municipal playground was co-created by the father of one of the most playful characters ever.

The rest of him lived another 61 years and was buried elsewhere.

It's not your typical library, memorial, or book store.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

Dive bar built out of the remains of a whaling ship.

It should come as no surprise that the world's largest artichoke lies in the town that calls itself the "Artichoke Center of the World."

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.