Wiesbaden is the capital of the state of Hesse. It is an international spa and congress center in the Taunus and on the Rhine; the spas specialize in the treatment of rheumatism. Attractions include the Kurhaus and casino; the Wilhelmstrasse, with elegant shops and cafes; Hesse State Theater; the Greek Chapel; international riding and jumping championships in the grounds of Biebrich Palace at Whitsun; boat trips on the Rhine; and woodland walks.