until 1925 showed a crowned king's head, but for one, from 1266, that showed the Emperor on his throne. Nevertheless, the town adopted arms with this composition while still using the king's head seal. The arms have not changed since their adoption. The arms have been borne since 1609. Wine sponsorship In Oppenheim, wine was given considerable publicity by Mayor Dr. Heinz Scheller after he took office in 1935: For Scheller, the only city worthy of sponsoring Oppehneim's wine was none other than the capital, Berlin. The town of Ansbach and the city of Osnabrück were also subsequently chosen. To revive this wine sponsorship and to give thanks for the commitment to the town of Oppenheim, the Governing Mayor of Berlin, Klaus Wowereit, was “knighted” on 11 March 2006 by Mayor Marcus Held, earning the title of "Wine Knight" (Weinritter). The sponsorship has found active expression in, among other things, the town's participation in the estate festivals held by the Senate of Berlin in 2007 and 2008. At the invitation of Berlin's governing mayor, Klaus Wowereit, a citizens’ delegation, under Mayor Marcus Held, took part in the festivities at the German Embassy in Paris on German Unity Day, as well as during the jubilee celebrations of the Berlin-Paris city partnership. Culture and sightseeing Worth seeing are: Katharinenkirche, with the stained glass (the "Oppenheim Rose"), is the most outstanding Gothic church on the Rhine between the Cologne Cathedral and the Strasbourg Cathedral. Landskron Castle's ruins, with a lovely view over the Rhine rift and other church buildings in Oppenheim, also a venue for festival plays and other cultural events. The old town with its marketplace, town hall from 1621 (with a column from Landskron Castle's hall in front, which reputedly came from the Ingelheim Imperial Palace), the former town fortifications with the Gautor and Rheintorpforte (gates), clocktower and town wall remnants, and unique museums (German Viticultural Museum, Town Museum). Quite extraordinary is the Oppenheimer Kellerlabyrinth (“Oppenheim Cellar Labyrinth”) under the Old Town. Underground passageways, stairways and rooms link the houses and facilities with each other on a number of levels. In the heart of Old Town, near the Town Hall, there are altogether roughly 650 m of cellar passageways open to visitors, which are largely preserved in their original state. It is believed, however, that what has been opened to the public is only about 3% of the total underground passages.