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 dayNH0242 : Low water on the Abhainn Bhearnais by Richard Law
Summer flow on this river, which would clearly be a different proposition altogether in wetter weather. As it was, we paddled across with dry boots several times over the weekend.
Today's Photo of the dayUNB0470 : Auf der Edersee-Staumauer: Blick auf das Torhaus by Uwe Seibert
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.