Kibera (aka the Shadow City), Kenya, is one of the most densely populated places on earth; this means that 1,500 people on average live on the equivalent of a football pitch, or the area seen in this picture. Photo by Christian Als
Iberia Quarries, Portuga. This is an awesome series by Edward Burtynsky showing different rock quarries.
A photo of a whale skeleton in Admiralty Bay, Antartica by Sebatian Copeland.