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In last Friday's Open Thread, we asked you what San Francisco buildings must be visited if guests are in town for only a weekend. As expected, many chimed in with some of SF's best and most innovative buildings. We were so pleased with your favorites that we decided to turn them into a nifty map, which you can see below. Unless your guests have superpowers, they won't be able to visit all of these in a weekend. Any three or four would be a safe bet. Below, your picks for buildings that out-of-towners won't want to miss. Cheers!