Terraces and ornamental structures to SE of Cefn Mably

The terraces and ornamental structures to the southeast of Cefn Mably date from the 20th century and are designed to overlook the Rhymney valley. They consist of two levels, retained by rubble-stone and concrete revetments on the south and east sides, featuring concrete and stone steps and piers. The upper terrace is surfaced with tarmac and includes a round turret at the southeast corner, along with a low parapet on the south side that has two pairs of piers. On the west side, these piers lead to an octagonal turret on the west wall, which was erected in 1943 and dedicated to Dr. Powell. There is also a mid-20th century gazebo that overlooks the valley, constructed from coursed rubble with a pyramidal stone-tile roof. The gazebo has open sides on the west and north, while the south and east sides each have two windows.

The easternmost pair of piers on the upper terrace provide access to concrete steps leading down to the lower level, known as the winter garden. Here, there is a pavilion against the north wall, built of coursed stone and featuring a central doorway flanked by windows. Similar windows are found on the return elevations, all adorned with concrete architraves. A portico supported by fluted concrete piers and a moulded entablature previously held a flat roof that served as a viewing platform.