My historic document into the 1790's gateway Canons gate, all my research go to: <br /> <br />English Heritage: <br />1997 - Jonathan Coad <br />2012 - Steven Brindle <br /> <br />Department of the Environment: <br />1975 - R. Allen Brown. <br /> <br />many thanks to Subterranean History, for the Martello Tower photos. <br />http://www.subterraneanhistory.co.uk/ <br /> <br />For great sound effect visit: <br />https://www.youtube.com/user/YTSoundEffects
