A project of Cambridge’s Violence Research Centre, the London Medieval Murder Map is an interactive map that plots 142 murders from the first half of the 14th century onto one of two maps of London: a 1572 map from Braun and Hogenberg’s Civitates Orbis Terrarum or a map of London circa 1270 published by the Historic Towns Trust in 1989. The interactive map is powered by Google Maps, but the Braun and Hogenberg is not georectified, so the pushpins shift as you toggle between the base maps. [Ars Technica]