The best place in the park to test out your throwing arm.

These subterranean storage areas hold emergency water reserves.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

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

Early prototype for Frank Lloyd Wright's Guggenheim.

A vast city of the dead, where the deceased outnumber the living by more than a million.

This black shoreline is made up of exploded lava particles.

The beauty and the beast of hydraulic mining is on full display at this California Historic State Park.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

The capitol city's oldest existing cemetery.

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

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

Furniture tries to escape an abandoned building in San Francisco.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Only hotel where you can legally launder money.

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

Golden Gate Park's historic collection of plants.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Giant, friendly pelicans in Central London, the most unlikely of places.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

This former boomtown "island" is now submerged below Folsom Lake.

A working miniature city designed to teach kids about safety and presumably city planning.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.