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

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A ghost town at the airport is now a refuge for blue butterflies.

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

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

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

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

Historic funicular railway, believed to be the shortest railroad in the world.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Canyon walls shrouded in ferns.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Quite simply the largest tree in the world (by volume).

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

The private clubhouse for the members of the Academy of Magical Arts.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Olfactory delights in San Francisco's Botanical Gardens.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The rocks in this arid basin leave trails of movement behind them.