Fort Prinzenstein at Keta is one of Ghana's most historically significant European trading forts — built by the Danes in 1784 on the Volta Region coast, and today preserved as a museum and a powerful monument to the transatlantic slave trade. **Origins and Danish rule.** The fort was constructed by the Danish-Norwegian crown in 1784, on the orders of Governor Kiøge, to protect Danish trading interests along the Keta lagoon and the Anlo coast. It was named after Prince Christian's fort — "Prinzenstein" means "Prince's Stone" in Danish. It joined Christiansborg (Osu), Fredensborg (Ningo) and Kongensten (Ada) in the chain of Danish forts on the Gold Coast. The Danes had been active on this coast since the 17th century, and Keta's position on the lagoon made it a natural hub for trade in salt, fish, cloth, beads and — grimly — enslaved people. **The slave trade and its aftermath.** Like the other Gold Coast forts, Prinzenstein served as a holding point in the transatlantic slave trade, with captives held in its dungeons before being shipped out. Britain took over the Danish forts in 1850 when Denmark sold its Gold Coast possessions, and the fort continued as a colonial outpost. Over the following century it suffered badly from coastal erosion and tidal action — by the late 20th century large parts of the structure had collapsed into the sea, and it is now one of the most endangered heritage sites in West Africa. **The museum today.** The surviving section has been restored and operates as a small museum, with guided tours that walk visitors through the dungeons, the storerooms, the courtyard and the story of Danish-Anlo trade and the slave trade. It is a key stop on Ghana's "slave route" heritage trail, alongside Cape Coast and Elmina castles, Christiansborg, Fort Metal Cross at Dixcove and Fort St. Sebastian at Shama. The Keta Municipal Assembly and the Ghana Museums and Monuments Board have worked with Danish and international partners on preservation, though the sea continues to threaten what remains. **Visiting.** It sits in Keta town in the Volta Region, roughly two to three hours' drive east of Accra via the Aflao road, and pairs naturally with the Keta Lagoon, the Anlo cultural landscape, and the area's famous beaches and wetlands. If you're planning a trip, it's worth confirming current opening hours and entry fees with the Ghana Museums and Monuments Board before you go, since these change from time to time. There's an Ewe proverb that fits a place like this: *"Ame si me nya eƒe megbe la, etsi ƒeƒle o"* — one who does not know where they came from will not know where they are going. Prinzenstein is one of the stones that keeps that memory standing.