Not far from the Finnish capitals is the 18th-century fortress of Suomenlinna, which is called the Gibraltar of the North.

This fortress is located on several interconnected islands: Kustaanmiekka, Susisaari, Iso Mustasaari, Pikku-Musta (saari), and Länsi-Musta (saari). It is one of the most popular places, both among tourists and locals, and has been listed as a UNESCO World Heritage Site.