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 dayST0665 : Limestone contrast by Alan Hughes
While the wave-smoothed limestone shelf in the foreground is grey, the bands of limestone layers on the cliff have a yellowish tinge except at the base where they have been washed by the waves. Perhaps the colour is due to sand or iron salts. I would ...
Today's Photo of the dayUVU0709 : Müggelsee - Ufer mit Gefallenen Baum (Lakeside with Fallen Tree) by Colin Smith
Am Uferweg östlich von Rübezahl am Müggelsee.
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.