Now a holiday park surrounding the derelict remains of the house that was gutted by fire in 1973.
Ardmillan Castle was originally a modest fortalice of the late 16th century built on a large grassy mound and consisting of an oblong block of circular towers projecting on the NE and NW the latter of which has been removed. By the end of the 17th century it had been altered and was described as being 'built round, courtways; surrounded with a deep broad ditch' (Abercrummie 1688) traces of which remain.
The aspect of the mansion was entirely altered during the 18th century by the erection of a classic pedimented front, but an idea of the aspect of the original castle may be obtained from the NE. The rough cast walls rise three storeys to a wall-head which is crowned by a parapet at the east and west gables. A garret storey rises within the parapet. It was damaged by fire at the beginning of this century.
Tranter (1965) says the castle was surrounded by a barmekin or curtain wall but MacGibbon and Ross (1892) mention only the enclosing wall of the courtyard.
The castle belonged to the Kennedys of Bargany until 1658 when it passed to the Crawfords of Baidland (Mrs Grant, Ardmillan House).