Prohibition, a total ban on the production, sale, and consumption of alcohol, came into force in the United States in 1920. Lasting until repeal in 1933, the Prohibition era led to the proliferation of speakeasies: clandestine watering holes where people gathered to drink and enjoy music and entertainment. In an early form of mixology, cocktails were often designed to mask the taste of roughly produced homemade spirits. They may no longer be in danger of police raids and the quality of alcohol may be much improved, but there’s still something romantic about bars that fall a bit under the radar. Here are six of Manhattan’s best.