Olavinlinna

Olavinlinna - Credit: Wikimedia Commons

Olavinlinna (also known as St. Olaf's Castle; ; ; literally Olof's Castle) is a 15th-century three-tower castle located in Savonlinna, Finland. It is built on an island in the Kyrönsalmi strait that connects the lakes Haukivesi and Pihlajavesi. It is the northernmost medieval stone fortress still standing. Read more on Wikipedia

type: building
date from: 1475

Source: en.wikipedia.org