The Shell House Cilwendeg Farm

The Shell House at Cilwendeg Farm is an early 19th-century garden folly featuring an ornamental front made of rough white quartz with dressings of Cilgerran stone. It has a 20th-century slate roof that is concealed behind a stepped parapet. The building is single-storey with a three-bay front that includes two Gothic windows with timber Y-tracery and a central doorway. The original door was half-glazed with intersecting tracery and Gothic panels below, but this has been missing since 1980. The facade is constructed of white quartz rough walling topped with a slate shelf over a frieze of smaller quartz pieces, leading up to a high quartz parapet with slate coping that has a notched leading edge. Above the parapet are two stepped blocks of white quartz edged in notched grey slate. The original cresting consisted of two rough menhir-shaped white quartz blocks on each step, with a larger top finial featuring oddly humanoid projecting pieces; two pieces are missing from the right lower step.

The facade is framed by grey stone piers that have projecting bands and are vertically notched, with similarly notched capstones. These piers show remnants of a lime coating mixed with crushed red brick and coal grit. The sides and rear of the building are plain rendered, with the rear featuring a projecting band across the gable.

Inside, there are remnants of shell-inlaid panels on the walls and corner slate shelving with notched leading edges. The windows were edged with mussel shells. There is a damaged fireplace on the rear wall, and the remains of a floor inlay are said to have included horses' teeth and vertebrae. No roof plaster remains.