The brick-faced front of Mount Harmon Plantation's main building faces the sun on a bright summer's day. Mount Harmon Plantation originated as a land grant of 350 acres to Godfrey Harmon by Caecilium Calvert the second Lord Baltimore, in 1651. It prospered as a tobacco plantation during the 17th and 18th centuries, growing and exporting tobacco to the British Isles. The plantation boasts the northernmost existing tobacco prize house. Located in Cecil County, the now 200-acre estate lies on a peninsula of the Sassafras River. This area was known as "World's End" on early maps.