The old Rathaus, whose doorway is crowned by a baldachin and baroque dome, is on the Marktplatz. The attractive open staircase leading up to the entrance is the site of the festive Geissbock-Versteigerung (billy-goat auction) every Pentecost Tuesday, followed by a parade and folk dancing. The goat is the tribute neighboring Lambrecht has paid Deidesheim since 1404 for grazing rights. Inside, in addition to a richly appointed Ratssaal (council chamber), is a museum of wine culture, which examines the importance of wine throughout history. There's also a wine bar where you can taste and buy wines from the area.