Museum
Biržai Castle

Biržai Castle in Lithuania is distinguished by its location on the artificial Lake Širvėna. Originally designed as an earth bastion-type castle, it served as a defensive structure.
History+
The construction of Biržai Castle began in 1586 under the direction of Krzysztof Mikołaj Radziwiłł. As early as 1575, in preparation for the construction, a dam was built on the Agluona and Apaščia rivers, creating the artificial Lake Širvėna, covering approximately 40 km². The main construction work on the castle was completed in 1589.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://en.wikipedia.org/wiki/File:Lithuania_Bir%C5%BCe_Radziwi%C5%82%C5%82_Castle.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 56.2050, 24.7530