A grim castellated nineteenth-century prison in the Sundays Well district, west of the city centre, in operation from 1824 to the 1920s and now preserved as a museum. The cells, exercise yard, and governor's quarters are kept much as they were, with audio guides and a few wax tableaux to suggest what daily life was like. The exhibits cover the famine years, the conditions of women and child prisoners, and the building's later use as the first commercial radio transmitter in Ireland.
About fifteen minutes' walk uphill from the centre. The path along the river is the more pleasant way to get there.