Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This glamorous old building is said to have inspired the Tower of Terror.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

The blinking light atop the iconic landmark has been sending secret messages for decades.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

60 feet of towering steel balances gracefully.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

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

Olfactory delights in San Francisco's Botanical Gardens.

A man-made island in scenic San Francisco Bay.

Radioactivity still cause for concern at this urban explorer's paradise.

A shining, cold, black organ lies in San Francisco's financial district.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

A modest reminder of treacherous waters at the Golden Gate.

A Masterpiece with a Tragic History.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

A trash dump made beautiful by nature's power.