This massive redwood tree has a hole in the base big enough to drive through.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

The largest drain hole in the world.

340 bicycles, 65 feet high.

The haunting ruins of Jack London's dream house.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Recovered from the brink of extinction, at home in the Financial District.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

The unbelievably opulent home built for an infamous newspaperman.

A hotel and restaurant serving as the mecca of kitsch.

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

An alley covered with 20 years of bubble gum.

A popular winter vacation destination for migrating monarch butterflies.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

A music-filled, booze-soaked oasis in the desert.

A fake town founded by Western movie stars is now becoming a hip desert community.

Explore 10 acres of environmental sculptures.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

Ancient pueblos built into the base of a natural canyon wall.

A Wild West jailhouse that slid down the mountainside.