The Osu Castle (also known as Fort Christiansborg or simply the Castle) is a castle located in Osu, Ghana on the Gulf of Guinea coast in Africa. The castle was built by Denmark-Norway in the 1660s and has since changed ownership between Denmark-Norway, Portugal, the Akwamu, Great Britain and finally post-independence Ghana. The castle is a testament to European colonial influence in West Africa and the Atlantic slave trade. For this reason, the castle was inscribed on the UNESCO World Heritage List in 1979 along with several other castles and fortresses in Ghana.
The Osu Castle is located in the vibrant neighborhood of Osu in Ghana’s capital city, Accra. The castle is a large rectangular building with a square tower at each corner. The castle is built with local bricks and stones.