Constructed as a tower house in the late 14th century, and it was expanded as power of the Crichton family grew. However, the Crichtons fell from favour in the later 15th century, and the castle passed to the Earls of Bothwell. Francis Stewart, 5th Earl of Bothwell, constructed the Italianate north range in the 1580s, featuring an elaborate diamond-patterned facade. After Bothwell was accused of witchcraft the castle fell into neglect. The ruins are now in the care of Historic Environment Scotland, and are open to the public. A mile to the south-west is Borthwick Castle, a 15th-century tower house that is still in use.