Beyond Hillside Cemetery, Colorado 110 follows the Animas River to some spectacular ghost towns and mining ruins. Five miles above Silverton lie relics of the original county seat of Howardsville (1874–1939), where the Old Hundred Mine offers a tram car tour. Another 5 miles up the road, Eureka, the county's only company town, is littered with the huge cement foundations of mills. Among these skeletons stepping up steep mountain-sides are various concrete ruins of the Sunnyside Mill, a major gold, silver, lead, and zinc producer from 1873 until 1991. Archimedes must have smiled upon Eureka: More than $50 million in precious metals flowed out of this town and some 200 miners lived here as late as the 1930s, when Eureka's precipitous decline began. Eureka was dismantled and its homes moved to, among other places, Silverton, Durango, and the Idarado Mine on Red Mountain Pass.