Haley Hill Photography A roundup of unique cocktail bars hidden across town Often hiding in plain sight, speakeasy bars hold more than just mystery. San Diego boasts an array of hidden bars, most of which are tucked behind a secret entrance or require an exclusive code for entry. A product of the Prohibition era, these darkened places started as underground bars where alcoholic drinks were sold illegally. These days, speakeasies are known for offering an intimate cocktail experience, with some bars serving snacks or even full-course meals while others focus on rare spirits or eye-catching libations. Here are some of the best secret cocktail spots to explore in the city.