Fort Nassau - Credit: Wikimedia Commons
Fort Nassau, near Moree, Ghana, was the first fort that the Dutch established on what would become the Dutch Gold Coast. Because of its importance during the early European colonial period in West Africa and its testimony to the African gold trade and the Atlantic slave trade, the fort was inscribed on the UNESCO World Heritage list in 1979 (along with several other castles and forts in Ghana). Read more on Wikipedia
Source: en.wikipedia.org