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WikiPedia: Altstadt, Hamburg http://www.bilderbuch-hamburg.de/Stadtteile/Hambur... http://www.hamburg-guide.de/indexL1.jsp?did=47104 http://www.hamburg.de/hamburg-altstadt/ http://whc.unesco.org/en/list/1467 //tools.wmflabs.org/geohack/geohack.php?language=v... https://web.archive.org/web/20150402104058/http://... https://whc.unesco.org/en/list/1467/ https://commons.wikimedia.org/wiki/Category:Hambur...