An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

Semi-recognized center of the world, with many oddities.

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

The ghostly remains of an accidental sea.

A monument to a one-legged kidnapper, horse thief, and charlatan asks visitors to throw rocks in a pile.

Along a California highway is a kind of Jurassic Park made of metal.

A humble garage, world-famous for being the epicenter of a technology revolution.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

A large instrument played by the wind.

Worker-owned cooperative and resource for those looking to lighten their ecological footprint.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.

A promotional sun clock on the site of San Francisco's great raceway.

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

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

San Francisco’s condensed garden of incredible plant growth.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

An unassuming grey box sitting on San Francisco's Pier 17 is a "sky diary" of the coastal city's temperamental weather.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Once the fastest ship from San Francisco to Tahiti, the Galilee now lays in pieces in three different cities.

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