Alexanderplatz is a large public square and transport hub in the Mitte (city centre) district of Berlin, near the river Spree and the Berliner Dom. .Originally a cattle market, it was named in honor of a visit of the Russian Emperor Alexander I to Berlin on 25 October 1805..The Alexanderplatz has been subject to redevelopment several times in its history, most recently during the 1960s, when it was enlarged as part of the German Democratic Republic's redevelopment of the city center. It is surrounded by several notable structures including the Fernsehturm (TV Tower), the second tallest structure in Europe. the Park Inn Berlin and the World Time Clock, .Following German reunification the Alexanderplatz has undergone a gradual process of change with many of the surrounding buildings being renovated. ., and the biggest underground railway station of Berlin, Many historic buildings are located in the area around Alexanderplatz. The traditional seat of city government, the Rotes Rathaus, or Red City Hall,BERLIN-GERMANY 16/08/2009..