View the most popular Photo of the Day images from 2011, featuring Namibian thorn trees, a whitetip shark and diver in the Bahamas, a birch-covered boulder in the Adirondacks, Dubai skyscrapers ...

View the most popular Photo of the Day images from 2010, featuring a tiger in India, the cliffs of Moher, a sunset over Wakawau Bay, a puffin, penguins, a jet flying over a St. Maarten beach ...

Photo editors at the magazine chose the top 20 photos from a selection of 2.3 million images. Every year, photographers at National Geographic ... scientist holds a 70-day-old rhino fetus.