The architecture of Gdańsk is mostly of the Hanseatic variety, a Gothic style common among the former trading cities along the Baltic Sea and in the northern part of Central Europe. The architectural style of Wrocław is mainly representative of German architecture since it was for centuries located within the Holy Roman Empire. The centres of Kazimierz Dolny and Sandomierz on the Vistula are good examples of well-preserved medieval towns. Poland's ancient capital, Kraków, ranks among the best-preserved Gothic and Renaissance urban complexes in Europe.