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 dayTQ8009 : The Glen with development encroaching by Patrick Roper
The Glen, a small area of wilderness, lies between Woodland Vale Road and London Road
Today's Photo of the dayUNB2884 : Kassel - Fontänenteich im Bergpark Wilhelmshöhe by gps-for-five
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.