How to Find America's "Hidden" Bars Slideshow

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Wilson and Wilson (San Francisco)

This popular spot is actually located inside its sister establishment, the highly acclaimed craft cocktail den, Bourbon & Branch. To get into the detective agency-themed, Prohibition era-style bar — the concept for which was inspired by an actual missing woman from the 1930s whose purse was discovered in the walls during the space's construction — you must first make reservations online. With only 20 seats available, reservations can be made for up to two people, for no more than two hours. Once you've made your reservation, you'll receive a confirmation with a password that you have say at the door at Bourbon & Branch (which, coincidentally, is distinguished by a sign outside that reads "Anti-Saloon League"). Then, finally, a host will walk you across the main bar and through another door to the narrow, concealed space.