Culzean Castle is the former home of the Marquess of Ailsa but is now owned by the National Trust for Scotland. Culzean castle was constructed as an L Plan Castle by order of David Kennedy, 10th Earl of Cassilis. He instructed the architect Robert Adam to rebuild a previous, but more basic, stately house into a fine castle to be the seat of his earldom. The castle was built in stages between 1777 and 1792. It incorporates a large drum tower with a circular saloon inside (which overlooks the sea), a grand oval staircase and a suite of well-appointed apartments.