The Fuggers, lessees of the mercury Historical milestone · Almadén, Valle de Alcudia, Ciudad Real Image of Almadén, not of the place itself. Incorporated in perpetuity into the Crown of Castile in 1523, the quicksilver mines were leased to the German bankers Fugger, the Fúcares, who worked them during a good part of the sixteenth and seventeenth centuries against the credits granted to the monarchy. siglo XVI Photo: Raimundo Pastor (CC BY-SA 3.0 es) What to see and do in Almadén