This castle’s origins date back to the 11th Century when the Bishop of Rochester, Gundolf, undertook to build one of the first stone castles in England. The Kentish ragstone square keep, which dominates Rochester’s skyline, was added in 1127 by William de Corbell, the Archbishop of Canterbury and, at 125 feet high, is the tallest Norman keep in the UK. Although subject to cycles of decay and restoration since the 13th Century, including an infamous siege by King John, there is still much of interest for today’s visitor.