On a rainy afternoon in Johannesburg, why not explore one of the city's many museums? The Apartheid Museum is a must-visit, offering a comprehensive look at South Africa's history. The Johannesburg Art Gallery is another great option, showcasing a diverse collection of African and international art. If you're interested in natural history, head to the Origins Centre at the University of the Witwatersrand, where you can learn about the evolution of humankind. Museums provide a fascinating and educational way to spend a rainy afternoon in Johannesburg.