After slipping through the Jutland peninsula, our first call in the Baltic is an invitation to explore Berlin, a city re-invented since the Wall came down. An overnight call in St Petersburg showcases the treasures of the Hermitage before Discovery calls at each of Scandinavia's capitals. The avant-garde lines of Helsinki's pioneering architecture alternate with the island charms of Stockholm and its scenic Gamla Stan district, Copenhagen's heady blend or designer stores, palaces and funfair parks with Oslo's Vigeland statues, Stave churches and Viking long boats.