Three years ago, I made a trip up to Drogheda to see the four lights at the mouth of the Boyne. Three of them are south side of the estuary and the other, Aleria, is on the north side. I managed to get the south side ones polished off but found the one on the north side too difficult to locate. See here.
Recently though I revisited the problem and viewed the lighthouse on Google Earth. Hmm! I thought. Looks like you'd get a much better view from the south side of the estuary. So I drove to the village of Mornington in co. Meath and just where the road bends at a right angle, I took the small road that leads down past the Range Rear and Range Front lights and parked in the little car park beyond. Fifty yards further on and there's a perfect view of Aleria, sitting at the end of her breakwater.
Built in 1936.