One of the largest and most important castles in Jordan, with an area of ​​25,300 square meters and a height of about 1,000 meters above sea level. Its construction dates back to the era of the Moabites, and the Nabataeans used it, as evidenced by the presence of Nabataean statues engraved in the first foundations of the castle.  When the Crusaders established the Latin Kingdom of Jerusalem in the year (1099 AD), they occupied the southern region of Jordan in the years (1115 and 1116 AD) and established the Barony of Karak and Shobak. In the year (1142 AD) the Crusaders seized the Karak fort and started the construction and strengthening of this fort, to protect the southern side of the kingdom and secure the road between Damascus and Egypt during the Crusades, and it was of immunity and strength that it replaced the castle Al-Shobak, which was built to the south thirty years ago. Salah al-Din al-Ayyubi imposed a severe siege on the castle for a period of time, then managed to seize it in the aftermath of the Battle of Hattin. The rule of the castle was later transferred to the Mamluks and then the Ottomans, and it did not have a major historical role after the Crusades until the Great Arab Revolt, in which it played a role in controlling the transportation routes between the Hijaz, the Levant and Egypt.