Most famous work of one of Frank Lloyd Wright's sons.

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

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

Canyon walls shrouded in ferns.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

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

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

World-famous, Pink's still manages to keep its prized cult fetish status.

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.

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

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

America's most famous piece of self-built architecture.