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Originally built as a summerhouse for the Hanbury family, Shell grotto is a listed II* building. Set in the floor are bones and teeth of animals set in patterns to form arcs and circles, stars, hearts and diamonds. The walls are mostly bare stone, with calcite crystals and the remains of moss, trees and other vegatation in places. The ceiling is the glory of the Grotto, hence a visit is required to reveal its true magnificence.