Explained @ http://photography.nationalgeographic.com/photo-of-the-day/plitvice-lakes-autumn-croatia/
Took me a moment or two to decide whether to share this or not Explained @ http://photography.nationalgeographic.com/photo-of-the-day/greenland-ice-phenomena-fredericks/
A nice one @ http://photography.nationalgeographic.com/photo-of-the-day/jokulsarlon-glacier-iceland-aurora/