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 dayNY4607 : Footpath and wall Kentmere Pike by Tom Richardson
Today's Photo of the dayUPA4152 : Der Angerlosesee bei Bad Staffelstein mit Blick zum Clubhaus by Günter G
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.