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Unter den Linden is Belin's most important street. Start at Potsdamer Platz and walk down to Alexanderplatz. You will see a lot of old buildings, some dating back to the Prussian-German monarchy. Among those worth taking a closer look at are: the Arsenal, the Crown Prince's Palace, the Opernpalais, the Palace of William I, Humboldt University, St. Hedwig's Cathedral, the State Opera, the Royal Library and the New Royal Guard House. Expect between one and two hours for this tour. If you get tired get on bus 100 or 200.