Klaipėda Castle, also known as Memelburg or Memel Castle, is an archeological site and museum housed in a castle built by the Teutonic Knights in Klaipėda, Lithuania, near the Baltic Sea. The Teutons called the castle Memelburg or Memel, and Klaipėda was generally known as Memel until 1923, when Lithuanian military forces took over the city. The castle was first mentioned in written sources in 1252, and underwent numerous destructions and reconstructions in the centuries that followed. During the 19th century, having lost its strategic importance, the castle was demolished. Archeological work was performed at the site during the 20th century, and in 2002 a museum was established underneath one of its bastions. Currently, the castle is being restored. The construction works are scheduled to finish until 2020.
The Christian Teutonic Order had been waging an ongoing war against the Prussians during the 13th century; in order to entrench their gains, the Teutons built a number of castles in the area. One such castle was planned for a location between the Nemunas and Dangė rivers. A written account of this plan is dated to 1252, when a Grand Master of the Teutons, represented by Eberhard von Seyne, made an agreement with the Curonian bishop to build this fortification. In the same year the Christians constructed the castle and named it Memelburg. The new castle was wooden, protected by a tower, and was in a marshy area. It is likely that this first castle was located on the left bank of the Danė river. It soon became a prime outpost in the war between the Christian Orders and the pagan Lithuanians allied with the Samogitians.