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 daySD3688 : Looking across Low Dam by David Dixon
Small (artificial) tarn immediately below High Dam.
Today's Photo of the dayULE9455 : Baltrum - Nordstrand (North Beach) by Colin Smith
Sand, Meer und Himmel - Strandblick ostwaerts in Richtung Langeoog.
Random photo (doesn't have a daily photo)WV3581 : Looking north from Les Rocques Barrees Road by Chris Gunns
Vale Mill converted into an observation post
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.