Penrith Castle, Penrith in the Eden Valley, of Cumbria.
Penrith Castle was built in the 14th century by William Strickland who became Bishop of Carlisle and then Archbishop of Canterbury. It was later developed by Ralph Neville who played a key role in defending the area against the Scots. In 1471 the castle was transformed into a grand residence by Richard, Duke of Gloucester who later became Richard III. This red sandstone castle has been a ruin since 1571. Free entry.