Archaeologists have found a monumental structure buried under the sands of Petra, according to a new study that drew on satellite imagery to scan the ancient city.

Satellite surveys of the city revealed a massive platform, 184ft by 161ft, with an interior platform that was paved with flagstones, lined with columns on one side and with a gigantic staircase descending to the east. A smaller structure, 28ft by 28ft, topped the interior platform and opened to the staircase. Pottery found near the structure suggests the structure could be more than 2,150 years old.

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