HAMBURG, GERMANY - MAY 12: Fireworks explode over the cruise ship Aida Blu during the celebrations of the 823rd anniversary of the establishment of the port of Hamburg on May 12, 2012 in Hamburg, Germany. Emperor Frederick Barbarossa is said to have issued the city a charter for customs-free travel from its harbor to the North Sea on May 7, 1189, considered to be the birthday of the port, which is the largest in Germany and second-busiest in ...
more HAMBURG, GERMANY - MAY 12: Fireworks explode over the cruise ship Aida Blu during the celebrations of the 823rd anniversary of the establishment of the port of Hamburg on May 12, 2012 in Hamburg, Germany. Emperor Frederick Barbarossa is said to have issued the city a charter for customs-free travel from its harbor to the North Sea on May 7, 1189, considered to be the birthday of the port, which is the largest in Germany and second-busiest in Europe after Rotterdam. (Photo by Adam Berry/Getty Images)
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