Biržai Castle

Biržai Castle, located in the town of Biržai within northern Lithuania's Aukštaitija region, stands as a significant example of 16th-century military architecture. Constructed between 1575 and 1589 under the orders of Duke Krzysztof "the Lightning" Radziwiłł, it was designed by architects including Georgas Pirkas and Adam Freytag in the Renaissance style. The site is historically notable for being the first Italian-style bastion fort in Lithuania and one of the earliest in Northeastern Europe. Its creation involved a massive engineering project that included damming the Agluona and Apaščia rivers to form the artificial Lake Širvėna, which surrounds the fortress and served as a critical defensive barrier.

Throughout its history, the castle served as the primary seat of the Biržai-Dubingiai line of the powerful Radziwiłł family and functioned as an essential stronghold during the Polish-Swedish wars. The complex originally included a manor house, church, arsenal, and barracks, forming an integrated defensive system with the town. Although the structure eventually fell into ruins, it underwent major reconstruction starting in the 1980s and was most recently restored in 2013. Today, the castle is recognized as a national cultural monument and remains well-preserved, showcasing a blend of Renaissance and Baroque architectural elements.

Currently, Biržai Castle serves as a vibrant cultural hub owned by the Biržai Region Museum SĖLA. The residential manor within the castle grounds houses a regional history museum founded in 1928, a library, and a restaurant, making it accessible to the public. Designated as a national heritage site in 1998, the castle continues to attract visitors interested in its unique hydro-engineering features and its role in protecting the northern Lithuanian border with Livonia. It stands today not only as a testament to past military ingenuity but also as a center for local education and tourism.