Arad Fort is one of Bahrain's most important fortified castles. The Fort was built in the style of Islamic forts at the end of the 15th and early 16th centuries. Due to its strategic location overlooking various sea passages of Muharraq Island, Arad Fort was used as a defensive fortress throughout history, from the time Bahrain was occupied by the Portuguese in the 16thcentury to the reign of Shaikh Salman Bin Ahmed Al-Khalifa in the 19th century. Arad Fort was most recently restored in the 1980's, a process which took three years. In order to maintain the historical authenticity and value of Arad Fort, exclusively traditional materials were used, such as coral stone, lime and tree trunks.