The city of Lagos includes many ancient monuments, the most famous of which is the historic Lagos Castle, which was built by the Arabs in the eighth century. Lagos Castle is also known as the Castle of the Rulers, as the castle was somewhere in the middle of the seventeenth century that housed the residence of the city's ruler. Lagos Castle has been included in the List of Monuments of National Importance in Portugal since 1924; When you are near, do not miss visiting it to learn about its history.