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 dayNZ2563 : Trinity Square Car Park by Peter McDermott
Demolition of Trinity Square multi-storey car park in Gateshead town centre. The sad demise of an iconic landmark structure.
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.