Potentially more civilizations • Earth.com

And, even though the drones and aircraft have helped experts learn more about Petra and Al-Ula, their job is far from over. Excavator and educator at King Saud University, Abdulrahman Alsuhaibani, told the BBC, “What makes this work so important on the world stage is that it will provide an account of not just Mada’in Saleh and Petra but earlier civilizations that are largely unknown to us.” Photo Credit: David Kirkland/Design Pics / Getty Images

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