An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

The longest burning light bulb in the world.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

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

The black lab that was voted mayor of a California town is forever remembered by a life-size statue.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.