Hundertwasser Park is an outdoor exhibition park on Udo where visitors see the architecture and works of Hundertwasser. The Hundertwasser special exhibition shows 24 foundation editions and 22 original prints, from childhood studies to works from his prime. Completing the stamp tour earns a button souvenir, and the admission ticket includes one free coffee at the cafe inside the park. There is no shade, so the park is hot on sweltering days.