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 dayNN4396 : Burn above Shesgnan on Speyside by ian shiell
Today's Photo of the dayUPU2104 : Kaufbeuren - Kaiser-Max-Straße vom Rathaus aus by K-H Lipp
Geograph Britain and Ireland, also has a slightly simplified site schools.geograph.org.uk intended for use within Schools.