Home to the "Circus" trees created by Axel Erlandson.

A house built from trash known as the poor man's Hearst Castle.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

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

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

A winding path built in secret on the edge of the continent.

A 140-year-old castle with underground caves hidden in San Francisco.

A monument to the love people have for their pets.

This turn of the century masterpiece has a mysterious goaty interloper.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A hidden subterranean installation offers a view of the sky.

A huge musical instrument played by the ocean.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The restored and active Victorian-era final resting place of San Francisco.

A whimsical antique shop with a strong air of mystery, filled with items from ages, and what feels like worlds, past.

This shop specializes in oddities and Victorian-inspired wonders.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

Where the polar bear watches over everything, and every drink is a double.

A storybook European village in Berkeley.