Blacksod Lighthouse in Co. Mayo is, perhaps, best known for its indirect role in changing the course of history in connection with the D-Day landings in 1944. This arose due to weather readings taken at the lighthouse by Maureen Sweeney, wife of the lighthouse keeper, resulting in the decision to delay the landing in Normandy by the Allied side in WW2 by a day.
The light at Blacksod Bay was first lit on 30 June 1866 and a series of commemorative events in connection with this 150 year anniversary will be held on the weekend of 27/28 June with another event on 30 June 2026.