MNN Galleries

14 once-great lost cities

Petra

Photo: Ralf Siemieniec/Shutterstock

4 of 16

Petra

Petra is Jordan's most prized archaeological wonder, famed for its rock-cut architecture. Due in part to being enclosed by towering rose-colored rocks, the ancient city remained unknown to the Western world until 1812. It was declared a World Heritage Site in 1985.