The Thomas A. Greene Memorial Museum in Milwaukee, administered by the University of Wisconsin–Milwaukee’s Department of Geosciences, preserves the mineral and fossil collection assembled by Thomas A. Greene, a druggist and avid amateur naturalist. Built largely in the 1880s and 1890s, the collection grew to about 75,000 specimens, including irreplaceable fossils from southeastern Wisconsin quarry outcrops that no longer exist and minerals from across North America and beyond. Greene’s heirs built a fireproof museum in 1913 to house it, and that building became a National Historic Landmark in 1993 for preserving an unusually significant intact amateur geological collection. The collection is now housed in Lapham Hall.