The origins of the collection at the Deutsche Bundesbank Money Museum in Frankfurt date back to the days of the Deutsche Reichsbank (founded in 1875). The Money Museum provides information about the history of money and the way it works, and has an extensive collection of coins and banknotes from around the world. It shows what type of "valuables" have been used as currency throughout history: from Kauri shells and cocoa beans to giant stone disks. Visitors can also learn about important events in the modern history of money, such as the world economic crisis in the 1930s. Closed on Saturdays, 24 Dec., 25 Dec., 31 Dec. and 1 Jan., Easter Sunday and 1 May. Guided tours on request.