Milnerton Lighthouse (located on Woodbridge Island) was commissioned in 1960 to help ships find their way into Table Bay. Apparently the small stretch of coastline between Green Point and Milnerton has seen more than 150 ships wrecked over the last few centuries - more than any other section of coastline in South Africa.
Cape Town's city lights make it difficult for navigators to distinguish the harbour lights, and so this lighthouse, together with those at Green Point and Robben Island, make it a whole lot easier to get into the harbour safely at night. (I can barely parallel park, so I'm rather in awe of those who steer ships, no matter how many lighthouses they have to help them.)