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An explorer descends into the Majlis al Jinn cave in Oman. At more than 50 stories deep, it's one of the largest caves in the world. The cavers' mission is to determine if Oman's deep caverns could be safe for tourists to enter.
Think your photo is the "Ultimate" winner? Submit your best in six different categories.
See how Lipton is dedicated to sustainable agriculture. View photos from Boyd Matson's trip to Africa.
Always read up about native customs before traveling to a foreign culture. Always smile.
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Whose Earth-saving idea should win $20,000? Check out the finalists now, and vote July 7-20!