The circular tower was erected in 1796 on the orders of James Craig to improve the defence system of Simonstown. It has been claimed that this is the oldest British structure of its kind in the world, as well as the first building to be erected after the first British occupation of the Cape in 1795. It was declared a National Monument under old NMC legislation on 1 September 1972.

-34° 11' 34.8", 18° 26' 24"