Situated in Namibia's central highlands, Windhoek, the capital, is an attractive city surrounded by clusters of hills and the impressive Auas and Eros Mountains. There are three easily accessible resorts in the area. The Daan Viljoen Game Park lies about 24 km west of Windhoek and is set in the rolling hills of the Khomas Hochland. Various species of antelope as well as zebra, baboons and ostriches can be seen. The bird life is prolific with about 200 species represented. There are two hiking trails, one of 1,5 km and a semi-circular route of 9 km. The Reho Spa Recreation Resort on the outskirts of Rehoboth is 90 km south of Windhoek on the main tarred road, and offers a thermal bath, outdoor swimming pool and cafeteria. The Von Bach Dam and Recreation Resort just south of the town of Okahandja are ideal for aquatic sports and angling for carp, bream and black bass. Okahandja, 72 km north of Windhoek has a deep historical significance for the Herero people. Every year, usually on the last Sunday in August, they gather together for their annual pilgrimage to the graves of their ancestors buried in the town. On the outskirts of the town there is a large open-air arts and crafts market. The Gross Barmen Hot Springs Resort about 100 km north of Windhoek in its setting of tall palm trees with its large indoor thermal bath and open-air swimming pool has a restful atmosphere. The town of Otjimbingwe lies in the picturesque environs of the Khomas Hochland. The Rhenish Mission built an 8 m high "Powder Tower" there in 1872 for purposes of defence.