The platform atop this verdant volcano was built with the help of a royal elephant.

Tubing through a cave lit with glowworms is a magical underground experience.

The last of Amsterdam's original sea level markers remaining in place.

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

A sharp bend in a dramatic river canyon cut through red rocks.

Most-visited and most-photographed slot canyon in the American Southwest.

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Venue for strange sideshow displays and musical acts.

One of California's oldest continually used high schools has an interesting history, both on and off screen.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

A giant can of fruit cocktail is all that remains of what was once the world's largest cannery.

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

A giant chess set, minus the psychedelic drug trip.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

An extensive collection of ancient Egyptian artifacts and mummies.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.