B&GC

Denver

This speakeasy (whose name stands for Boys & Girls Club) is hidden inside the Halycon Hotel in Cherry Creek. Getting into B&GC is no small feat -- you have to go down the alley between Second and Third avenue, and look for a sign that says "Stair 3" and a golden doorbell. However, once you're there, there's no guaranteeing you'll get in: the bar is members-only, and the process of becoming a member is just as secret as the bar's location. That said, there's no hurt in trying to get past the door.