Ajloun Castle, also known as Qal'at Ar-Rabad, is a 12th-century Muslim castle situated in the northwest of Jordan, specifically in the province of Ajloun. It was built by Izz al-Din Usama, one of Saladin's generals, in 1184-1185 as a military fort and beacon to protect the region from Crusader invasions and to control the local iron mines. Standing atop a hill, the castle offers panoramic views of the Jordan Valley and the highlands of north Jordan. Its location was strategically chosen for its ability to send signals to other castles in the case of danger. The castle's design is an outstanding example of Islamic architecture and military construction of the time, featuring a massive gateway, a moat, and a series of tunnels and passages. Ajloun Castle has been expanded and reconstructed several times throughout history. Today, it is a preserved historical site and a museum that provides visitors with insight into medieval warfare and defense strategies. The surrounding area is rich in olive trees and green forests, contrasting with the ruggedness of the castle's stone architecture, making it an attractive site for history enthusiasts and nature lovers alike.