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Sigmundskron Castle (German: Schloss Sigmundskron, Italian: Castel Firmiano) is an extensive castle and set of fortifications near Bolzano in South Tyrol. Today its ruins house the fourth mountain museum established by the South Tyrolean mountaineer, Reinhold Messner. On 9 June 2006 the MMM (Messner Mountain Museum Firmian) was opened in this fortified castle dating to the Late Middle Ages.