A vast facade carved high above the main basin, reached by an 800-step staircase that climbs the cliff at the far end of the colonnaded street. The climb takes about 45 minutes from the museum at the base; it is steep, but the steps are well cut and there are donkey-handlers offering rides if your legs give out.
The Monastery is starker than the Treasury — simpler lines, less ornament, more presence. There is a small cafe in front where you can buy mint tea and sit on a cushion, and a short scramble to a viewpoint behind reveals the Wadi Araba dropping away towards Israel. Aim to be here in the late afternoon: the climb is cooler and the western light is on the facade.