Duncannon Fort

Located where the Suir / Barrow estuary opens out before joining the sea at Hook Head / Dunmore East, this lighthouse is only partially visible from land as access to it is not open to the public. The Fort itself is open, but on request, a guide accompanied me through a locked gate to get the photo above. He told me that the light flashes white when all is well, but red whenever a boat is heading for trouble!
Both Hook Head and Duncannon North lighthouses are visible from it.