While Petra features many impressive structures, the most famous monument is officially called Al-Khazneh, or "The Treasury." Carved into the rose-colored sandstone cliff face, it is not actually a treasury but a monumental tomb, likely built for the Nabataean King Aretas IV in the 1st century AD. Another significant "temple" is the Great Temple, a massive 7,560-square-meter complex that served as a central civic and religious hub for the city. Travelers also frequently hike up to Ad-Deir, commonly known as "The Monastery," which is similar in design to the Treasury but significantly larger and more austere. Other religious sites include the Qasr al-Bint, which was likely the main temple of the Nabataean god Dushara, and the Temple of the Winged Lions. Each of these structures showcases the sophisticated rock-cut architecture of the Nabataeans, blending Hellenistic and Eastern styles into the iconic "rose-red city half as old as time."