1. Robben Island
Nelson Mandela spent 18 of his 27 years of imprisonment in a cell measuring 2.4 by 2.1 metres on this flat, wind-scoured island 6.9 kilometres off the coast. Robben Island was a political prison from the late 17th century until 1996. Today it is a UNESCO World Heritage Site, and the tour is one of the most affecting things to do in Cape Town. The visit begins with a 30-minute ferry from the Nelson Mandela Gateway at the V&A Waterfront. On the island, a bus covers the lime quarry where prisoners did hard labour and the village where warders lived. Then comes the prison itself. A former political prisoner guides you through the cell blocks and stands in front of Mandela's cell to describe daily life. Three former Robben Island inmates went on to become president of South Africa: Mandela, Kgalema Motlanthe, and Jacob Zuma. Tours run several times daily and the whole trip takes about 3.5 hours including ferry time. Weather cancellations are common, especially in winter when Table Bay gets rough. Book the first departure: the light is better, the crowds smaller, and if your morning ferry is cancelled there is a backup slot. This is the must-see in Cape Town that stays with you long after the tan fades.