Hopkins Medicine has launched an effort to sell some of the remaining original slate tiles from the historic Johns Hopkins Hospital Dome to help fund the restoration of a Habitat for Humanity rowhouse on Washington Street in East Baltimore. Amazing that the tiles remained on the Dome for 116 years, until an exterior restoration in 2005. The original pieces came from the Peach Bottom Slate quarries that stretched from York and Lancaster counties, Pa., to Harford County. These once were suppliers of the finest slate tile in the world.