A grove of "candelabra redwoods" deep in California's Lost Coast.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The original place where water met land in the City by the Bay is outlined in brass.

This frequently-photographed waterfall takes only a short hike to visit.

The largest drain hole in the world.

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

Spiral labyrinth hidden in the hills above Oakland, CA.

Bonsai garden in Oakland is curated by the first non-Japanese female bonsai master in the United States.

This (occupied) house is 10 feet wide and full of spite.

This mysterious series of teeny guerrilla installations sheds a whimsical light on street art in Oakland.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Gorgeous purple flowers drape from the world's largest blossoming plant.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

This 19th century train workshop is a treasure trove of railroad history.

The California capital city once stood 10 feet lower than it does today.

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

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.