With an actual library of premium tequila displayed inside leather books and built-in, back-lit cages along black walls (hence "La Biblioteca"), this smart Murray Hill lounge is the spot to hit up when your happy hour needs a professional upgrade. Tucked underneath Zengo, the bar is long, dark, and handsome, and -- in addition to the 400 varieties of tequila and mezcal -- offers Latin-Asian fusion eats, such as charred tuna wonton tacos and spicy crab guacamole. Candles, Persian rugs, and leather banquettes adorn the dim, cozy space, which maintains an upbeat vibe thanks to its house DJs. Feeling extra swanky? You can rent a private tequila locker in the hidden back room, where you're free to store bottles for up to six months, and present a "library card" to a waiter whenever you'd like them to retrieve one for you.