The Faraday Street market (also called the Herb Market or the Muti Market) is South Africa's largest traditional medicine market. Spread across an indoor hall and the surrounding streets in the CBD, it sells the raw materials that sangomas — traditional healers — use in their practice: dried herbs, roots, bark, animal bones, skins, feathers, and compounds whose ingredients you may prefer not to examine too closely. The smell alone is something to experience.
This is a working market, not a tourist attraction. Visitors are welcome, but behave as you would in a mosque or any other place that is sacred to people's daily practice — respectfully, without pointing cameras at people without asking. The surrounding streets are rough, so arrive and leave by Uber. The museum attached to the market (the Museum of Man and Science) provides useful context on traditional healing practices. It is one of the more genuinely unexpected things you can do in any African city, and it is in the middle of one of the world's great metropolises.