Poland; city of Poznan (former German: Posen): Prussian fortification Cathedral Lock with skywalk bridge to Porta Posnania (English: Poznan Gate) heritage centre; opened 2014; The interactive heritage centre of Cathedral Island (Polish: Ostr體 Tumski) is located at the Cybina river on the bank of city quarter Sr骴ka. Via a skywalk bridge across the river; it is connected to the old Prussian fortification Cathedral Lock on Cathedral Island. Cathedral Lock was built in 19th century (1828 onwards).