Spudgun67 on Wikimedia Commons Behind this modern wall is a 12th Century vaulted undercroft, part of a complex once containing the Abbot's Gaol (the town prison until 1842) and the King's Lodging Cathedral Square, Peterborough by Peterborough Civic Society Colour: blue Wikimedia: Flickr: How to add yours Spudgun67 on Wikimedia Commons Google Streetview OpenStreetMap