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

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Canyon walls shrouded in ferns.

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).

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

A museum befitting the city responsible for supplying the majority of the world's LSD.

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

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

This short-lived tea and silk farm is believed to be the first permanent Japanese settlement in North America.

Under the shadow of its towering parent tree, a rare specimen of sequoia produces ghostly white leaves.

The only theatre in the world constructed specifically for sound movement.

A huge work of Burning Man-inspired outsider art on the grounds of a California winery.

This California museum is home to one of the largest collections related to the 'Treasure Island' author.

This massive redwood tree has stood in Northern California for nearly 2,000 years.

The flow from this waterfall sometimes comes out of springs below its rim.

California's first suspension bridge.

A sparse, solitary sequoia still stands as a living tribute to the famous conservationist who planted it—but it's dying.

A working model of a pressure-driven, high-speed rail whizzes around a private vineyard.

This bakery sits on the site of the Black Panther Party's first headquarters.

A playing field for a popular French past time can be found tucked away in a quiet corner of Golden Gate Park.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.