Cornwall Historical Society Cornwall, Cornwall-on-Hudson and Mountainville Museum and Office Town Hall 183 Main Street, first floor Cornwall, New York 12518 845-458-5389 email@example.com Visit the museum on Tues, Wed, Thurs from 10a to 1p or call for an appt. Photo: Blizzard of 1888. Building is the Union Hotel on Main St. now Fancy Nails and a computer shop. Photo thanks to Steve Hey. Building is owned by the Hey's family.