[1] Its grounds are separately listed, also at Grade II, on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

The main hospital building covered 5 acres (2.0 ha), designed to accommodate 750 patients across ten wards, five each for men and women.

[3] The first medical superintendent was Edwin Goodall, whose then advanced approaches and therapies resulted in the hospital acquiring a reputation at the forefront of mental health care.

H.Winnett Orr an American orthopaedic surgeon documented the services and his training at Cardiff in 1917 before serving in France.

There were 200 beds retained for civilian use, which enabled early treatment of post traumatic stress disorder of military patients.

[11] After the introduction of Care in the Community in the early 1980s the hospital went into a period of decline and the number of resident patients reduced.