Located in Hunter's Point, Archimedes Banya is San Francisco's only authentic Russian bathhouse. The communal banya features pools, a cold plunge, saunas, and a private soaking tub. There's also a full-service spa with massages, scrubs, facials, and more wellness services. Perhaps the best spot at the bathhouse is the rooftop bar with killer views, drinks, and naturally, naked sunbathing. You'll have to pay full admission to the spa to access the roof.