Summerhouse, and retaining wall and urns to terrace south of the conservatory

The summerhouse, along with a retaining wall and urns, is located south of the conservatory at Alton Park and dates from the early 19th century. It is constructed of ashlar stone and features a circular design at the east end of the terrace, facing west. The structure is one storey high and consists of three open bays supported by Tuscan columns and pilasters. It has a heavy cornice and a moulded ashlar dome topped with a pineapple finial. The east side includes a round-headed window flanked by Tuscan pilasters.

The retaining wall stretches approximately 229 meters and is punctuated by panelled piers, topped with a flat coping and urns. At the east end of the wall, there is a grotto situated directly beneath the summerhouse. Toward the center of the wall, a segmental arched recess leads to a doorway that accesses a small chamber beneath the terrace. The western part of the wall rises in a series of ramped steps.

This structure is an important part of the garden layout at Alton Towers, which is recognized as Grade I on the Historic Buildings and Monuments Commission Garden Register.