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The inside of Petra's most famous edifice—whose function during Nabataean times is still unknown—is surprisingly small. Possibly built in the first century A.D. during the reign of Aretas IV, Al Khazneh is one of more than 800 monuments in Petra. Much of the city is still underground, and nearly every stab of a shovel yields something new.
Special thanks to the Petra National Trust and the Petra Archaeological Park for their assistance on this project.
The preservation of this World Heritage Site in Jordan is being put at risk as more and more tourists flock to this ancient city of stone.
The votes are in! Check out a new list of the world's seven greatest man-made wonders.
In Afghanistan, over 20,000 pieces of ancient gold jewelry and artifacts were discovered in 1979. Mysterious "keyholders" pledged their lives to hide the treasure from plunderers. Did they succeed?
Take a photographic journey through Montana and enter for a chance to win a trip for two!
Eighteen percent of the world's population can't get safe drinking water. Test your water knowledge.
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