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 dayTQ2977 : Nine Elms by Peter McDermott
Looking up the River Thames at Nine Elms with Battersea Power Station and Chelsea Bridge in view.
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.