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

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

A common entry point to the Griffith Observatory trail holds its own wonders.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

Travelers exchange letters with woodland creatures at this mini post office.

The site of murders and Satanic cult gatherings.

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

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

The final resting place of a space program monolith.

In this century-old literary safehouse, print is alive and well.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

The largest permanent Monopoly board makes one of the longest games even bigger.

A 300-ship graveyard, with a few still visible at low tide.

The last of its kind in the country.