How much did it cost to build the ancient city of petra?

The exact cost to build the ancient city of Petra is difficult to determine, as it was constructed over several centuries and involved various resources and labor from different cultures. Estimates suggest that the total investment could be equivalent to hundreds of millions of dollars today, considering the extensive infrastructure, monuments, and water management systems created by the Nabataeans. However, precise financial records from that time do not exist, making it challenging to provide a definitive figure.