Dresden architecture and numerous world-renowned museums and art collections, Dresden has been called "Elbflorenz" (Florence of the Elbe). The incorporation of neighbouring rural communities over the past 60 years has made Dresden the twelfth largest urban district by area in Germany after Berlin, Hamburg and Cologne. The nearest German cities are Chemnitz to the southwest, Leipzig to the northwest and Berlin to the north. Prague, Czech Republic is about to the south and to the east is the Polish city of Wrocław. Dresden is one of the greenest cities in all of Europe, with 63% of the city being green areas
Accession of Hamburg to the German Customs Union (Zollverein) by Hamburg. Thus Hamburg consumers had lower prices than consumers within the union. The German imperial constitution of 1871 brought no change in the legal situation of Hamburg and Bremen. Article 34 (and related provisions) went into the new constitution. After Hamburg had agreed to the constitution of the North German Federation, negotiations were held between November 1867 and March 1868 on the size of the free area. It was agreed that this would cover the Hamburg urban area, but not the outlying areas, including Ritzebuttel, Bergedorf and the Vierland (which were a condominium with Lübeck until January 1868), Waldvörfer,