Gdańsk (Gdansk): Gdańsk is a beautiful port city on the Baltic Sea. The city was once an important member of the Hanseatic League, a trading alliance of medieval cities, and its architecture reflects this history. Visitors to Gdańsk can explore the Main Town, with its narrow streets and gabled houses; the Maritime Museum, which tells the story of the city’s maritime history; and St. Mary’s Church, the largest brick church in the world.