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 dayTQ8109 : St Leonards beach by Oast House Archive
Today's Photo of the dayUMA6848 : Naturschutzgebiet Schwanheimer Düne bei Frankfurt am Main by Klaus G
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.