The Lappeenranta Fortress is a valuable part of the Finnish, Russian and Swedish cultural heritage. The oldest buildings, including the guardhouse at the Main Gate that nowadays hosts the Cavalry Museum; the South Karelia Museum of Art buildings, the Orthodox Church and the Commandant’s House date from the latter part of the 18th century. Most of the wooden buildings are from the late 1800s, whereas the red-brick military barracks date from the early 20th century.