A classic advertising icon immortalized in regal bronze.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A creepy steel gremlin has protected the Bay Bridge since 1989.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

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

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.

The unbelievably opulent home built for an infamous newspaperman.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Get up close to emus and ostriches, or buy their tasty meat.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

The ghostly remains of an accidental sea.

A trash dump made beautiful by nature's power.

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

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The legendary building that needed ghostly approval before being built.

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

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

A dwindling menagerie of anthropomorphic oil derrick animals still dot the barren California landscape.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

A true treehouse near Hawai'i Volcanoes National Park.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.