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Study in colors: A rider exits one of the many U-Bahn (subway) stations in Berlin, which claims the most extensive subway system in Germany.</p>
Alexanderplatz
Study in colors: A rider exits one of the many U-Bahn (subway) stations in Berlin, which claims the most extensive subway system in Germany.
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Berlin City Life
See Berlin photos in this gallery from National Geographic’s Ultimate City Guide for Berlin.
