Mysterious Monumental Structure Found at Ancient Petra

Carved into desert cliffs, the towering, ancient city of Petra can trace its origins back at least 2,000 years. For two centuries, archaeologists have extensively studied what is left of Petra, but they continue to make new discoveries. By combining data gathered by Google Earth and satellite sensors, they observed the shape of what may have once been a giant stoneplatform, located about 0.6 miles (900 m) outside Petra's city center.