On the banks of the river Barrow, at the point where Counties Carlow and Laois shade into each other, stands this building, known as Clongrennan Lock (also Lanigan’s Lock). Not far away are what remains of Clongrennane Castle, a 15th century construction, with the now-ruined early 19th century residence of the Rochfort family close by. Was this building, with its little turreted towers at each corner, originally part of the same estate? There appears to be no information available about the site: all answers welcome.