Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Canyon walls shrouded in ferns.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

San Francisco's newly reopened hands-on science museum.

Quite simply the largest tree in the world (by volume).

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

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

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A castle that was built stone by stone by an eccentric journalist.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Olfactory delights in San Francisco's Botanical Gardens.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

The rocks in this arid basin leave trails of movement behind them.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

A trash dump made beautiful by nature's power.

The only theatre in the world constructed specifically for sound movement.

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

The legendary building that needed ghostly approval before being built.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.