Duns Castle, Duns, Berwickshire is a historic house in Scotland, the oldest part of which, the massive Norman Keep or Pele Tower, dates from 1320. The earlier house was transformed into a Gothic castle, 1818–22, by architect James Gillespie Graham. It is owned by the Laird, Alexander Hay of Duns and Drumelzier, a retired accountant. He and his wife, Aline, live at the castle. Alexander Hay (killed at the Battle of Waterloo) reputedly haunts the castle. There is a publicly accessible park and two man made lakes, the Hen Poo and the smaller Mill Dam.