The Alexanderplatz is a large public square and transport hub in the central Mitte district of Berlin, near the Fernsehturm. Berliners often call it simply Alex, referring to a larger neighbourhood stretching from Mollstraße in the northeast to Spandauer Straße and the Rotes Rathaus in the southwest. Alexanderplatz has been subject to redevelopment several times in its history, most recently during the 1960s, when it was turned into a pedestrian zone and enlarged as part of the German Democratic Republic's redevelopment of the city centre. It is surrounded by several notable structures including the Fernsehturm (TV Tower), the second tallest structure in the European Union. Alex also accommodates the Park Inn Berlin and the World Time Clock, a continually rotating installation that shows the time throughout the globe, and Hermann Henselmann's Haus des Lehrers. During the Peaceful Revolution of 1989, the Alexanderplatz demonstration on 4 November was the largest demonstration in the history of East Germany.