The National Heritage Council (NHC) is responsible for a few of the registered heritage sites in Namibia. The entrance fees and further info are in this PDF.

Image source: Greg Willis – http://greg-willis.com/gallery/Travel/Namibia06/AloegroveLodge/c-1689.jpg.html, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=7161426