Klaipėda Castle, known also as Memelburg, was founded by the Teutonic Knights in the 13th century at the strategic point where the Dane River meets the Curonian Lagoon. The site is now an archaeological museum, with exposed foundation walls and ruins showing the successive phases of construction and rebuilding over seven centuries of contested ownership.
The museum inside covers the full history of the castle and the city — from its origins as a Teutonic fortification through the Swedish, Prussian, German, and Lithuanian periods. The location by the river is pleasant, and the ruins are extensive enough to give a sense of the original scale. The castle sits very close to the old town, making it a natural addition to any walk around the historic centre.