Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

These six walrus head statues harken back to a time when this area wasn't far from the oceanfront.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

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

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

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

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

A whimsical antique shop with a strong air of mystery, filled with items from ages, and what feels like worlds, past.

A psychedelic labyrinth on the San Francisco bay.

Floating man-made island and upscale restaurant.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

A free, public museum dedicated to the fascinating science of sight.

The only visible piece of San Francisco's most famous shipwreck.

A modern mechanical planetary system, part of a 10,000 year clock.

A huge musical instrument played by the ocean.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

The restored and active Victorian-era final resting place of San Francisco.

An invitation-only museum of items natural and bizarre, arcane and exotic.

Half of a house.

This 19th-century church is now a popular roller rink.

These subterranean storage areas hold emergency water reserves.