See berlins picturesque castles churches and other landmarks from the water during this 3 hour river cruise to peacock island from the decks of a historic steam ship built in 1905 and restored in the 1950s cruise through the wannsee and the lakes south of the city admire sights such as the german forest and berlins largest nature preserve grunewald historic grunewald tower heilandskirche the unesco world heritage site of havelland and the fairytale like peacock island