Lochorwart Castle was a 13th century earthwork motte and bailey fortress, founded by Gilbert, de Laird of Lochorwart. In the 15th century, King James I, granted Sir William de Borthwick a charter to crenellate and he founded Borthwick Castle. The magnificent stone U-plan keep, which stands on the site of the earthwork castle, is of five storeys, with two wings of seven and eight storeys. It is defended by an irregular walled courtyard, which was originally flanked by round towers on the angles and encased by a ditch. Visit pending. 2 miles north-east is Crichton Castle and 4 miles north-west is Dalhousie Castle.