One of the most unusual geological features, recognizable from a dozen hit movies.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Visible below the waves are memorials to the city's Gold Rush dead.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

An invitation-only museum of items natural and bizarre, arcane and exotic.

The abandoned personal amusement park of the King of Pop.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

One of the ghostly stops along Route 66.

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

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

A modern mechanical planetary system, part of a 10,000 year clock.

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

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

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

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

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

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

Eons old volcanic activity created one of the most stunning rock formations in the United States.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Exotic feline breeding compound and conservation center.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

The ghost town that ended up on Ebay.