Historic St. Mary’s City. Job Posting: Archaeological Field Technician, Leonard Calvert House Site. Why Work Here. Historic St. Mary's City is located on the St. Mary’s River, in a beautiful tidewater landscape of. water, rolling hills, farmland, and forest. The 835-acre living history and archaeology museum is on. the site of Maryland’s first capital (1634-1695). Our team is fortunate to build upon decades of. cutting-edge research, with recreat...