This is an awesome picture. Supercell Thunderstorm by Sean Heavey, nationalgeographic: A supercell thunderstorm rolls across the Montana prairie at sunset. This was a winning shot in the 2010 National Geographic Nature Gallery Photo Contest.
Hawaii is on a lot of people's travel bucket list. You may think sand beaches and volcanoes, but formations like this are breathtaking. What's your favorite thing about Hawaii? (Na Pali Coast Waterfall Cave, Hawaii)