MAPPING LONDON Revealing the City’s Hidden History At The Guinness Vaults with Matt Brown  on Sunday 12th July 2026 at 1:30 pm For over 20 years, Matt Brown has been exploring and writing about London. But he's also been mapping it. In this talk, Matt will describe how maps can provide fresh insights into the city's history and culture: from a retrospective map of Anglo-Saxon London, to a complete map of every location mentioned in Dickens's novels. He will reveal the previously overlooked, unknown and extraordinary details he has uncovered about the capital by spending hundreds of hours colouring the John Rocque map of 1746 -- a project which has taken two years already, with a long way still to go. Tickets £12.50 each or £30 for a day pass to Mapping Lost London. Please click here to purchase. Matt Brown Matt Brown is editor at large of Londonist and the main contributor to “Londonist: Time Machine”, a newsletter dedicated to the city’s history. Over 21 years as a professional London explorer, he has waded along the buried River Fleet, spent a night in a haunted plague pit, crawled through hidden tunnels beneath London Bridge and walked the tracks under Leicester Square at 2am. He is the author of 13 books, including “London Night and Day” (2015), “Everything You Know About London Is Wrong” (2016), the bestselling “Atlas of Imagined Places” (2021) and its sequel “Atlas of Imagined Cities” (2023), with his latest, “The Boroughs of London” (2025), exploring the quirks and histories of the capital’s 32 boroughs.