Castell Penfro / Pembroke Castle is an enormous oval castle, mostly surrounded by a mill pond. The castle was extensively restored in Victorian times and is dominated by the gatehouse on the outside and the huge circular keep on the inside. Pembroke is the only castle in Britain to be built over a natural cavern, a large cave known as the Wogan. Historically, Pembroke is important not only for its masonry but for the fact the Harri Tudur, who became Henry VII and inaugurated the Tudor line of mo