This chic newcomer to the rooftop bar scene just opened this month in the new AC hotel in the Garment District. Castell (castle in Catalan) plays homage to the classic cocktails of the 1960s with a menu full of martini concoctions—dry, dirty, shaken, stirred, to name a few—and other winners like a Smoked Manhattan and an on-tap Salted Grapefruit Paloma. The design is Spanish-inspired with arches and geometric shapes, warm walnut-colored walls, leather benches and Miro-like art on the walls. Grab a booth (quickly before the crowds come!), settle in and take in the views of the Midtown skyline.