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 daySJ4065 : Chester Races, May 1977 by Jeff Buck
A meeting at Chester Racecourse on 5th May 1977. Photo taken on a Canon FTb using Ilford HP5 35mm black and white film.
Today's Photo of the dayUND6358 : Großes Becklinger Moor by Oxfordian Kissuth
Wasserloch im Moor.
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.