Kristall Galerie is a small mineral gallery in central Swakopmund, best known for its enormous quartz crystal and displays of gems from Namibia and beyond. It is not a long visit, but it is a useful stop if you are interested in the geology behind the desert landscape.
The gallery also has shops selling crystals and mineral souvenirs. Come for the display rather than the retail side, and pair it with a walk through Swakopmund's colonial-era centre.