This side view of Castell Coch demonstrates its enormous size. The base of the Keep is almost ten feet thick, has a diameter of 39 feet and is constructed with limestone. It is a majestic tower containing the Drawing Room and the bedroom of John Crichton-Stuart’s wife, the former Gwendolen Fitzalan-Howard. The Marchioness stayed here only occasionally after he died in 1900 at the age of 53.