Köthen is a small town in the eastern German state of Saxony-Anhalt, best known as the birthplace of the composer Johann Sebastian Bach.
The town is located on the edge of the Harz mountains, and is surrounded by forests and lakes. The main attraction is the Bachhaus, a museum dedicated to the composer, which contains exhibits on his life and work. There are also several churches in the town, including the St. Bartholomäi Kirche, which contains a number of works by Bach. Köthen is a quiet and relaxing town, and is a good base for exploring the Harz mountains.