Natty Longshoe's Comical Castle was an attraction in Hedgewick's World of Wonders. True to its name, it was a castle, with a drawbridge and a moat.
A punishment platoon, Porridge and Clara Oswald fortified the castle to defend against Cybermen. It played a vital role in defeating the Cybermen as it was easily defendable and easy to hide in. (TV: Nightmare in Silver)