El Deir ("The Monastery"), the Monastery Trail, Petra, Wadi Musa, Petra.
Hidden high in the hills, the Monastery is one of the legendary monuments of Petra. Similar in design to the Treasury but far bigger (50m wide and 45m high), it was built in the 3rd century BCE as a Nabataean tomb. It derives its name from the crosses carved on the inside walls, suggestive of its use as a church in Byzantine times. The ancient rock-cut path of more than 800 steps starts from the Basin Restaurant and follows the old processional route.