Arnhem Cave

Namibia's longest cave system. There are several species of bats, and some endemic shrimp in an underground lake. The hiking tour is guided and takes about an hour. It leads 100 m underground. Bring a torch, and wear old clothes: The walk is entirely on bat guano, and the hiking group will smell like a public latrine when it reemerges into the sunlight. There is a bar and a pool but no restaurant. You can also camp or stay overnight in chalets. The camp site is well equipped, with electricity and hot water but almost no grass.