Edges of the empire • Earth.com

Petra became the de facto seat of the Nabataean civilization, but it wasn’t the only city established by the one-time nomadic tribe. They also built Hegra, known today as Mada’in Saleh, and it became their secondary capital and second-largest settlement. Hegra also marked the Nabataean Kingdom’s southernmost point. Photo Credit: Basheer Olakara / Wikimedia Commons 

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