Riyadh is the capital city of the Kingdom of Saudi Arabia. It is one of the most important cities in the Kingdom, because it has many antique landmarks. There's a very extraordinary castle called: Al-masmak, which means the thick high building. It was built in 1289 Hijri, and then was used as a store where the soldiers keep their weapons. Furthermore, This castle is famous for its antiquity and is considered the most prominent castle. Moreover, many people from around the world come every year to visit these ancient castles, and observe the aesthetic designs.