A winding path built in secret on the edge of the continent.

A 140-year-old castle with underground caves hidden in San Francisco.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

Colorful Native American paintings are hidden within this small cavern.

Exceptional Nepalese food can be found in a Texas gas station.

A small Wyoming town is home to the state's oldest-operating soda fountain.

A 1950s Googie burger stand is now a Los Angeles landmark.

An eatery within a Bay Area Buddhist temple pulls off all your favorite Vietnamese classics without the meat.

At this 1940s-era neighborhood favorite, you can still drink a cherry phosphate.