A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

One of the last surviving buildings of a once large and thriving Chinatown.

An alley covered with 20 years of bubble gum.

A hotel and restaurant serving as the mecca of kitsch.

Drink a Guinness under the wings of Reagan's retired Air Force One in his presidential library.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

Rusty industrial city full of oxidized distillation towers.

Kayak out to a floating restroom.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

Colorful Native American paintings are hidden within this small cavern.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

From the Difference Engine to the Cray-1, all under one roof.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

An extensive collection of ancient Egyptian artifacts and mummies.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

A 19th-century California philanthropist is entombed beneath the telescope he funded.

A memorial to the most decisive Native American victory of the Plains Indian War.

This erect, phallic geological spire wasn't always named so domestically.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

Meet cowboys and ancient beardogs at this one-of-a-kind crossroads of Western history.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

This Great Plains museum pays tribute to both the prosperity and tragedy of the North American fur trade.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The first declared National Monument in the United States.