Dalhousie Castle is situated near the town of Bonnyrigg, 8 miles (13 km) south of Edinburgh.
The red stone castle is situated in a strategic spot overlooking the River Esk.
The drum tower, the oldest part of the current structure, an L Plan Castle, dates to the mid 15th century.
King Edward I (Longshanks) stayed at the castle on his way to meet Sir William Wallace at the Battle of Falkirk.
In 1400, Sir Alexander Ramsay withstood a six-month siege at Dalhousie by English forces led by King Henry IV.
In 2003, Dalhousie Castle was purchased by the Von Essen Hotels company for a reported price of £10 million.