A pigeon flies through the outside area between prison wings of HMP Pentonville, London, UK. The cell windows are protected with metal bars and netting, but green drop lines can be seen hanging off the windows and leading to other cells. This is how prisoners pass contraband items to each other. The external walls are protected with razor wire. HM Prison Pentonville is an English Category B men's prison, operated by Her Majesty's Prison Service. Pentonville Prison is located on Caledonian Road in the Barnsbury area of the London Borough of Islington, north London, United Kingdom. (Photo by Andy Aitchison)
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