Cēsis Castle built
1209 CE.
Shown on the map at 57.313°, 25.270°.
Cēsis Castle (German: Schloß Wenden) is one of the most iconic and best preserved medieval castles in Latvia. The foundations of the castle were laid 800 years ago by the Livonian Brothers of the Sword. The most prosperous period Cēsis Castle experienced was during its next owners, the Teutonic Order. It became one of the key administrative and economic centers of the Teutonic Order in Livonia and was the seat of the Landmeister in Livland. The first serious damage was done to the castle during the Livonian War, when it was besieged by the army of Ivan the Terrible. In the course of the siege of 1577 approximately 300 people within the castle committed mass suicide by blowing themselves up with gunpowder. Cēsis Castle was still in use during the following century but it fell into disuse after the Great Northern War. Today the castle is the most visited heritage site in Cēsis and one of the 'must see' destinations in the Baltic states.
Text from the Wikipedia article Cēsis Castle, licensed CC BY-SA 4.0.