Affleck Castle, also known as Auchenleck Castle, was built on the lands of the Auchenlecks in the 15th century. In the early 18th century it belonged to a family of Reids, who forfeited the castle in 1746 because of their activities as Jacobites. It has not been occupied since 1760, when a new mansion was built.
Affleck Castle is a well-preserved free-standing tower of four storeys and a parapeted garret. It is 18 m tall, and has thick rubble walls, with several mural rooms. A few steps down from the entrance is the basement, which is sub-divided.
The hall, which is on the first floor, has a vaulted ceiling; this supports a withdrawing room. Above the main staircase is an entresol bedroom, almost 2.1 m square, reached by an eleven-step staircase in the east wall. The stairs lead from the hall. The withdrawing room has a spy-hole into the hall below. This would have allowed all movement to the main turnpike stair to be observed. The room has window seats, wall closets, and a shafted fireplace. A step up from this room leads to a circular oratory, equipped with aumbry, piscine, holy-water stoup and stone candle-holders. This room is also vaulted. There is a bedroom in each of the upper floors.
A projection by the door, with a square caphouse, houses the stair. There is another square caphouse over the south-west angle. There are two devices for dropping missiles or liquids on attackers: one over the arched door; and the other on the west front, while the ground floor is equipped with gun loops.
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