The Animas Museum, a local-history museum operated by the La Plata County Historical Society in the 1904 City School Building, a three-story sandstone structure constructed in 1904-1905 in what was then Animas City (on the banks of the Animas River -- El Rio de las Animas Perdidas, or River of Lost Souls) above what is now Durango, the seat of La Plata County in southern Colorado.