Petra - the ancient city carved out of rock in Jordan- is one of the most fascinating historical sites in the world, and for good reason. The pink-hued sandstone cliffs of Petra hide a stunning array of temples, tombs, and carved statues, all dating back thousands of years. The most famous structure is the Treasury, an ornately carved facade that stands guard at the entrance to the city, while the Monastery, perched high on a cliff, offers sweeping views of the desert.