The ancient city of Petra, (A) [carving / carved] into rose-red cliffs by the Nabataeans over two thousand years ago, remains one of the most breathtaking archaeological sites in the world. The intricate facades, (B) [which / what] were designed to serve as tombs and temples, showcase a remarkable blend of Eastern and Western architectural traditions. Today, Petra attracts hundreds of thousands of visitors annually, and the preservation of its structures (C) [is / are] a top priority for international conservation organizations. Scholars continue to study the advanced water management systems that allowed this desert civilization to flourish in an arid environment.

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