Mystery House
[img width=700 height=393]http://dynaimage.cdn.cnn.com/cnn/q_auto,w_900,c_fill,g_auto,h_506,ar_16:9/http%3A%2F%2Fcdn.cnn.com%2Fcnnnext%2Fdam%2Fassets%2F180202111813-winchester-tease.jpg[/img]
https://winchestermysteryhouse.com/Quite possibly, the south SF bay's most notable tourist trap that doesn't involve the tech industry. Maybe the arms industry, but only in a tangential sense.