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 dayNS1964 : Skelmorlie ROC Post by Raibeart MacAoidh
This relic of the Cold War was operated by the Royal Observer Corps and was open between April 1965, and September 1991. Skelmorlie ROC Post http://www.secretscotland.org.uk/index.php/Secrets/SkelmorlieROCPost
Today's Photo of the dayTLT9078 : Isteiner Schwellen by Klaus Graßmück
Stromschnellen im Oberrhein bei Istein
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.