>>1045262The Sutro Baths. In the 19th century, this was the largest privately owned swimming pool in the world. Now it's a huge seaside ruin with a fantastic view of the coast.
The Academy of Sciences. Besides being a really cool museum if you're into any kind of science, the building has a meticulously designed living roof and an entire rainforest biosphere dome built inside of it. It could be cool to see.
The Exploratorium. Remember when I said the place above this one was cool if you're into science? FUCK that place. This one is better. Completely unrelated to architecture? Definitely, but this was the only place I could mention it. They have a miniature cyclone chamber, a robot arm you can challenge to a balancing game, and an instant gameshow setup! Every Thursday night they serve drinks and only let adults in.
Old Ship Saloon. The city's oldest bar, and it's built into the wreck of a ship that crashed more than 150 years ago. No idea how good the food and drinks are, but architecturally speaking it sounds fun.
The places below are definitely cool, but aren't destinations or big landmarks like the other places. They're still extremely cool and unique, but not filled with other things to do or always centrally located.
Vaillancourt Fountain. If you want alien and weird, check this thing out. It's weird enough to be a point of argument among some people in the city who don't know what the artist was thinking.
Urbano Sundial. It's a 26 foot tall sundial built over a tiny pool and surrounded by grass. Why is there a sundial in San Francisco? Because somebody wanted a landmark to build houses around.
450 Sutter Street. This is crazy. If you've played Bioshock or seen any of the art, this could legitimately be something you'd find in Rapture. A ridiculously ornate lobby that pays homage to Mayan designs and Art Deco. The security guards are more than happy to let people in and talk about the specifics of the designs. Google this one and see what I mean.