Wolkenturm Grafenegg, Lower Austria, Austriaschmatz (66) in bescouted • 5 years ago The Wolkenturm, created by the architects schröder schulte-ladbeck in 2008, is an open-air arena in the park of Grafengg Castle in Lower Austria. The arena hosts the well-known Grafenegg Festival, an international festival for classical music. bescouted architecture austria grafenegg arena