San Francisco, California
At this point, you're probably familiar with Bourbon & Branch, the Doug Dalton-funded, beloved SF mixology destination that’s known just as much for its expertly mixed cocktails as the “hidden” bars that lie inside its walls: The Library, Wilson & Wilson, and Russell's Room. But you probably don't know about its super-hidden basement bar, Ipswitch. Yes, it's a hidden bar inside the hidden bars. Like Inception, with way more booze, a two-seat bar, and an overall Western saloon vibe. To get in, you climb through a trap door in the floor of the main bar. You'll need to book a large party to even be considered for Ipswitch clearance, and even then you might not make it. And despite its mother bar’s reputation for complex and brilliant cocktails, you’re better served snagging a glass of bourbon -- after all, it just fits the theme here (and the bar is super small, too). Ipswitch shares its name with the actual speakeasy that operated on Bourbon & Branch's grounds during Prohibition. Frankly, it’s probably even harder to get in now. Basement bars are a cruel mistress.