meantime, the large civil land development in the style of the Wilhelminian period was placed under monument protection. In the Second World War the quarter was not so strongly bombed as the inner city, but nevertheless many buildings were destroyed, particularly in the north. In the time of the occupation by the American armed forces the district developed an active nightlife, allowed soldiers free rein to endless brothels. Infrastructure The Bahnhofsviertel is well connected to the public transport system because of its central location. The Hauptbahnhof, which borders the borough, offers connection to regional and long distance trains. Two tram lines (11 and 12) cross the Bahnhofsviertel on Münchner Straße. The Willy-Brandt-Platz U-Bahn station and Taunusanlage S-Bahn station are also easily reachable. The well-known meaning of Kaiserstraße has been lost among the street traffic, travel from the Alleenring to the Hauptbahnhof is no longer possible through the Kaisersack. Instead the main traffic vein today is Gutleutstraße, which flows into the theatre tunnel and offers a connection to the old part of town. The roads arrange in a chessboard-like fashion and make orientation easy. The wide east-west streets are constructed like boulevards and communicate the charm of a big city. Numerous nineteenth century buildings have survived through World War II and became chaste residential houses in the 1950s and 1960s, whilst several supplemented skyscrapers. Best known are the Silvertower and the Gallileo at Jürgen-Ponto-Platz (named after the murdered president of Dresdner Bank), the Skyper and the Gewerkschaftshaus in Wilhelm-Leuschner-Straße. The latter was built in 1931, (the architect was Max Taut), and was then the biggest skyscraper in the city. The best known of many hotels in the Bahnhofsviertel, the InterContinental, is also in Wilhelm-Leuschner-Straße. There are no large parks but in the south of the district lies the Main Riverbank, one of the most popular green areas in Frankfurt. In 1860 a silted branch of the Main, the Kleine Main, was filled up and the offshore island Mainlust was connected to the main bank. On this land Sebastian Rinz, the city gardener, laid out a green area with Mediterranean vegetation which was soon named Nizza in common speech. The Frankfurt families Guaita and Loeen had already possessed large landscaped gardens in the climatically favoured area of the river west of the old city walls since the seventeenth century. Red-light district Frankfurt's red-light district is in Bahnhofsviertel. The core of the district