Petra is a vast, unique city, carved into the sheer rock face by the Nabataeans, an industrious Arab people who settled here more than 2000 years ago, turning it into an important junction for the silk, spice and other trade routes that linked China, India and southern Arabia with Egypt, Syria, Greece, and Rome. Entrance to the city is through the Siq, a narrow gorge, over 1km in length, which is flanked on either side by soaring, 80m high cliffs. Passing through the Siq is an experience with its dazzling colors and rock. As you reach the end of the Siq you will catch your first glimpse of Al-Khazneh (Treasury), an awe-inspiring experience. A massive façade, 30m wide and 43m high, carved out of the sheer, dusky pink rock-face and dwarfing everything around it. It was carved in the early 1st century as the tomb of an important Nabataean king and represents the engineering genius of these ancient people.