The castle estate is designated Grade I on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

[3] Part of the D-shaped medieval boundary fortifications remain, forming a wall around the current house.

[6] The sequence of terraces in the gardens was created for the Windsor-Clives in 1865–6 and extended in the early 20th century.

[5] The house became a convalescent hospital for soldiers during World War I, with the banqueting hall containing a ward of 40 beds.

[7] In 1947, by his will, Ivor Windsor-Clive, 2nd Earl of Plymouth, gave the castle and estate to the National Museum of Wales.