Before revision: Detail of the Shell Grotto, Nienoord, Netherlands, in a rectangular wooden pavilion, c. 1700 Part of the Shell Grotto in Margate A shell grotto is a type of folly, a grotto decorated with sea shells.
After revision: Detail of the Shell Grotto, Nienoord, Netherlands, in a rectangular wooden pavilion, Part of the Shell Grotto in Margate A shell grotto is a type of folly, a grotto decorated with sea shells.