Lappeenranta Fortress sits on a high ridge overlooking Lake Saimaa and the town harbour below. The earthwork ramparts were constructed in stages by both Swedish and Russian occupiers from the early 18th century onwards, and the fortress district is now a well-preserved ensemble of old military buildings, craft workshops, museums, and summer cafes spread across the hilltop.
The fortress area contains several small museums, including the South Karelia Museum, which covers the region's history from prehistoric times through the Soviet-era evacuations of the 1940s that reshaped Karelia's population. The cavalry barracks now house artists' studios and craft shops. The views from the ramparts over Lake Saimaa are the best in the city. Entry to the fortress area is free; individual museums charge admission.