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 daySD7076 : Fluted pothole by John Illingworth
One of several such features in this limestone area.
Today's Photo of the dayULD8242 : Monument to the construction of the Ems bridge, Meppen, 1990-1 by Rodney Burton
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.
... and a sub-project just focusing on images in Ireland, www.geograph.ie.
Geograph Germany/Deutschland, also has a German/Deutsch language version at geo.hlipp.de.