
Kyminlinna is a historic fortress in Kotka built by Russia between 1791 and 1808 as a cornerstone of southeastern Finland's defensive system following the Russo-Swedish War. Initially constructed as a bastion fortress between 1791 and 1795 under the supervision of Russian General Alexander Suvorov and Dutch-born General Jan Pieter van Suchtelen, the original fortification was subsequently demolished and replaced with a dramatically larger fortress built between 1803 and 1808, featuring a distinctive five-corner caponier design spanning approximately 800 meters in diameter across 74 hectares. Strategically positioned to repel land-based attacks along the King's Road, Kyminlinna formed a double fortification system with the Ruotsinsalmi sea fortress. Though its military significance diminished after the Finnish War, the fortress was used for various purposes throughout the 20th century and is now publicly accessible, allowing visitors to explore the ramparts and contemplate its historical role.