Castel d'Aiano (Medial Mountain Bolognese: Castèl d'Ajàn) is a comune (municipality) in the Metropolitan City of Bologna in the northern Italian region of Emilia-Romagna, located in the Apennine Mountains about 35 km southwest of Bologna. Castel d'Aiano borders the following municipalities: Gaggio Montano, Montese, Vergato, Zocca. In April 1945, while engaged in combat in the area, Bob Dole was wounded by a German shell that struck his right arm