Mseilha / Mseylha / Msaylha Fort

The Mseilha Fort (Arabic: قلعة المسيلحة, romanized: Qal‘at al-Msaylḥa) is a fortification situated north of the village of Hamat in Lebanon. The current fort was built by Emir Fakhreddine II in the 17th century to guard the route from Tripoli to Beirut.^[2][3] The fort is built on a long, narrow limestone rock near the Nahr el-Jawz River. Its walls are constructed with small sandstone blocks quarried from the nearby coast and built onto the edge of the limestone rock. The thickness of the walls ranges from 1.5 to 2 meters (4 to 6.5 feet). The larger limestone blocks are the only remains of an earlier structure probably built for the same defensive reason.

Source: Wikipedia