In the middle of the 18th century Wallington Hall, west of Morpeth in Northumberland, was the seat of Sir Walter Calverley Blackett. Like many men of his time, he remodelled his park and introduced fashionable landscape features. On Rothley Crags, a windswept outcrop of rock north of Wallington Hall, he erected a sham castle which served as a distant eye-catcher from the house.