No matter who you are, pulling up a chair at Tommy's means two things are certain: You'll learn something about tequila, and you'll have a great margarita. Having created the renowned "Tommy's" margarita (fresh lime juice, agave syrup, and tequila), astonishing for its ability to showcase the tequila rather than muddle its flavor, owner and bar manager Julio Bermejo has amassed the best and most extensive collection of blue agave tequilas, not just in number of brands, but also in releases. His bar is possibly the only place in the world where you can have a vertical tasting of the same brand from different years under various distillers. Access to some of the rarer bottles is reserved for members of the Blue Agave Club, which requires trying a selection of 70 and a written exam. Finals never tasted so good.