such as in July 2013. In order to fight this phenomenon, weather stations known as "Hagelflieger" are stationed near the city and are largely funded by Daimler AG, who maintain several parking lots and factories in the municipal area. Landmarks and culture Inner city At the center of Stuttgart lies its main square, Schlossplatz. As well as being the largest square in Stuttgart, it stands at the crossover point between the city's shopping area, Schlossgarten park which runs down to the river Neckar, Stuttgart's two central castles and major museums and residential areas to the south west. Königstraße, Stuttgart's most important shopping street which runs along the northwestern edge of Schlossplatz, claims to be the longest pedestrianized street in Germany. Although the city center was heavily damaged during World War II, many historic buildings have been reconstructed and the city boasts some fine pieces of modern post-war architecture. Buildings and squares of note in the inner city include: The Stiftskirche (Collegiate Church), dates back to the 12th century, but was changed to the Late Gothic style in the 15th century and has been a Protestant church since 1534. Exterior: Romanesque/Gothic; interior: Romanesque/Gothic/Modern. Reconstructed with simplified interior after World War II. Altes Schloss (the Old Castle), mostly dating from the late 15th century, some parts date back to 1320. Renaissance style; reconstructed Alte Kanzlei (the Old Chancellery) on Schillerplatz square which backs onto the 1598 Mercury Pillar Neues Schloss (the New Castle), completed in 1807. Baroque/Classicism); reconstructed with modern interior, currently houses government offices. The cellars with a collection of stone fragments from the Roman times are open to visitors Wilhelmpalais (the King Wilhelm Palais), 1840 Königsbau (the King's Building), 1850. Classicism; reconstructed; has been housing the "Königsbau Passagen" shopping centre since 2006. The Großes Haus of Stuttgart National Theatre, 1909–1912 Markthalle Market Hall, 1910. (Art Nouveau) The Hauptbahnhof (Main Railway Station) was designed in 1920; its stark, functional lines are typical of the artistic trend 'Neue Sachlichkeit' (New Objectivity) The Württembergische Landesbibliothek state library, rebuilt in 1970. Friedrichsbau Varieté (Friedrich Building), rebuilt in 1994 on the site of the former art nouveau building Architecture in other districts A number of significant castles stand in Stuttgart's suburbs and beyond as reminders of the city's royal past. These include: Castle Solitude, 1700–1800. Baroque/Rococo) Ludwigsburg Palace, 1704–1758. Baroque, with its enormous Baroque garden. Castle Hohenheim, 1771–1793 Other landmarks in and around Stuttgart include