View this artwork by appointment, at Tate Britain's Prints and Drawings Rooms
Pier (sometimes Ramsgate) Castle, drawn at lower left of the leaf, is a square block with round corner towers and crenellated walls on the corner of Harbour Street and Kent Terrace overlooking the harbour wall. It was designed by Mary Townley, an amateur architect financed by her wealthy husband in the construction of a number of buildings in Ramsgate. Said to have been built in 1819 it is now occupied by a restaurant and café.
Sketches of Ramsgate run to folio 27 verso of the sketchbook (D10455; Turner Bequest CXL 24a). In view of their quantity, and direction from on and off-shore, Turner may have stayed in the town for several days.