India, Sept. 12 -- The original speakeasy was born out of necessity during the 1920-33 Prohibition era in the US, when hidden and dimly lit drinking rooms became a way to keep the party going. Pass Code Only (better known as PCO), which opened in 2012 in a Vasant Vihar market, was among the city's early speakeasy-style bars. It hid behind an unmarked entrance and a telephone booth, with a passcode that changes constantly. Hoots, which opened in 2016 in another market in Vasant Vihar, tucked itself behind a nondescript white door, while The Backyard in Punjabi Bagh played on the idea of a neighbourhood grocery store concealing a bar. Each gave Delhi a reason to seek out what was behind the door. "We initially tried to keep it a secret, but our success proved that Delhi could not keep it a secret. We're proud that taking that initial leap paved the way for the vibrant, narrative-led speakeasy culture we're seeing across the city. Having said that, a cocktail bar does not make a speakeasy. A speakeasy is a hidden cocktail bar," says Rakshay Dhariwal, Founder and Managing Director of Pass Code Hospitality. More than a decade later, that idea of the hidden bar has evolved. Here's taking a look at five of the city's most inventive hidden drinking spaces....