This Month in Photo of the Day: Nature and Weather Photos

A close-up shot of a thermal pool in Yellowstone National Park

(This photo and caption were submitted to My Shot.)

Have a great photo of a U.S. national park site? Submit your photos (tagged #parkwk) to My Shot by May 1, 2011. Then, check out our travel site to see a gallery of our favorites.

See more pictures of the Ten Most Visited National Parks »
See more pictures of Yellowstone »