1. A computer-implemented method of organizing photographs for display on an on-line map, the method comprising: accessing a plurality of photographs, each photograph associated with a map feature on the on-line map and a score indicating the photograph's suitability; selecting a set of candidate photographs responsive to the photographs' scores; determining a cluster from the set of photographs wherein the cluster has a shape based on a shape of the map feature; and storing the cluster as associated each of the photographs in the set.