Geograph is a concept and open source code for a online website to create a comprehensive collection of photographs capturing every part of given region.
Currently there are three active projects, shown below - including a photograph from each.
Today's Photo of the dayNC0328 : Heart shaped stone at the Bay of Stoer by Ulrich Hartmann
Today's Photo of the dayULV6160 : St. Ingbert, Besucherbergwerk Rischbachstollen by Paul L
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.