The Freedom Trail is the route of the Freedom Challenge mountain bike race. It starts in Pietermaritzburg and ends in Cape Town, or at least near enough, some 2,500km later. It climbs over mountains, across rivers, through forests and deserts, but cunningly avoids tar roads. It takes you to parts of the country that city folk will never see without making a catastrophically large navigational error.
More info can be found here:
http://www.freedomchallenge.org.za/