Kelburn castle was built in the 13th century, remodelled in the 16th century, and opened to the public, as a country park, in 1977. It’s one of many beautiful castles in Britain, but Kelburn stands out through its bizarre, grafitti-covered exterior. In 2007, after experts told him the outer facing would have to be replaced in order to prevent further damage to the castle walls, the Earl of Scotland invited grafitti artists to prove their skills on the walls.