The Tankwa Karoo National Park is a park with nothing: no road signs, no decent dirt roads, no visitors facilities, no trees and hardly any rainfall. It's both a Biodiversity Hotspot and a Scientific National Park, so entry permission needs to be arranged with the park before you visit.
With the Roggeveld Mountains dominating the horizon, you enter a koppie-studded landscape that's as close to walking on the moon as most of us will ever get. Go in August/September when the spring flowers come out and the succulents bloom, and you never again think of the southwestern Karoo as a 'simmering wasteland to be endured'.