Swan Oyster Depot, open since 1912 in Nob Hill, is a raw fish institution. The seafood is unbelievably fresh, and the menu includes everything from clams, oysters, and Dungeness crab to sashimi platters and sea urchin. The clam chowder, a buttery and briny both made with the day's clams, is awesome, as is the twice-cracked crab. Basically, everything here rocks. The narrow space has only 18 bar seats, and it's a great option for a solo lunch since parties of one can usually bypass the long wait.