Not really "nature", quite the reverse but still fascinating;
http://www.independent.co.uk/news/science/nasa-releases-stunning-satellite-images-of-the-earth-at-night-8389372.html?action=gallery&ino=3 (http://www.independent.co.uk/news/science/nasa-releases-stunning-satellite-images-of-the-earth-at-night-8389372.html?action=gallery&ino=3)