The "Monastery" in the ancient city of Petra, Jordan, is officially known as Ad Deir. It is one of the largest and most impressive monuments in the entire Petra Archaeological Park, even larger than the more famous "Treasury" (Al-Khazneh). Carved directly into a sandstone cliff face during the 1st century AD, Ad Deir stands approximately 45 meters high and 50 meters wide. Its name "The Monastery" likely comes from the crosses carved on its interior walls during the Byzantine era when the structure was reused as a Christian church. To reach Ad Deir, visitors must climb a grueling but scenic path of roughly 800 hand-cut stone steps through the mountains. The effort is rewarded not only by the sight of the massive facade but also by the "Great View" points located nearby, which offer panoramic vistas of the Wadi Araba desert and the border with Israel. In 2026, it remains a "must-see" for any traveler to Jordan, though it is recommended to start the hike in the early morning or late afternoon to avoid the intense desert heat and the bulk of the crowds.