Tynnelsö Castle

Tynnelsö Castle - Credit: Wikimedia Commons

Tynnelsö Castle () is a castle in Sweden. It is on Tynnelsö island in Lake Mälaren, a few kilometres north-east of Strängnäs. The castle was built during the Middle Ages by the bishops of Strängnäs. Read more on Wikipedia

type: military installation
date from: Oldest parts probably from the 13th century

Source: en.wikipedia.org