Please check the Restormel Castle website for the official opening hours. Standing in ruins amid beautiful countryside, Restormel is one of the most remarkable castles in Britain. The present circular structure, built in the late 13th century, was a luxurious retreat for its medieval owners and was twice visited by Edward, the Black Prince. The castle commands fantastic views across the valley of the river Fowey and is a favourite picnic spot – with beautiful spring flowers, and plants all year round.