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

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

The unbelievably opulent home built for an infamous newspaperman.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The abandoned personal amusement park of the King of Pop.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

San Francisco Bay's ghost town.

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

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

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

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

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

An essential stop before plundering, BYO Cutlass.

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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

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

Tiki luxury on Nob Hill.

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

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

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

San Francisco's newly reopened hands-on science museum.

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

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