|Keep and North Tower
The keep tower is a large building started in the mid-17th-Century and modified several times over the years. It is L-shaped in plan, with the wing facing the moat containing the defensive features, and a residential tower to the northwest. The east side provides access to the watch tower on the river via the main staircase turret, a very tall structure with observation rooms at the top overlooking the River Lin and a small terrace at the top, with a gazebo and flower-planting bed, over a room that has been used as a 'pleasance' in peaceful times; the terrace on the southeast side also has a flower bed. The two tower tops are also terraced (the southern having three turrets at the corners), with the top stories, marked 'private study' and 'art gallery' on the plan, having had various purposes over time.
From the basement on up, there are the following rooms: B. Vaulted cellars (fuel, food, wine, pantry, larder). G. Vaulted gate passage, Kitchen, Porter's Lodge, Guard Room, and main staircase with separate entry from the courtyard. E. Entresol floor, containing the Guards' Hall, portcullis room (armory), and dormitory, with a Music Room, an enthusiasm of the then-duchess in the early 19th Century, in the northwest tower, with access to the minstrel's gallery in the upper part of the Great Hall. 1. Library/Study, leading to a private stairway and the northwest wall walk, Parlor, formal Dining Room (having its own small kitchen), and the 'fancy' Armory with medieval weapons and armor. 2. Official rooms -- Privy Chamber, Anteroom, two-storied Chapel, Council Chamber, and Office. 3. Private, formal quarters for the Duke. 4. The main bedrooms. 5. Secondary bedrooms.
The North Tower is described above. It, and the Great Hall, were reconstructed in the 19th-Century, but pretty much to the same plans, after a disastrous fire. The Great Hall rises two stories, with a minstrels' gallery over the screens passage; note the small 'observation' room in the east wall at the second level.