X marks the spot

Great day exploring various Neolithic sites.

We had to take cover during the middle of the day as the heavens unleashed a torrent of abuse. I don't think it was aimed directly at me, but I'm always slightly concerned. The only place to take cover was in the Musee De Prehistoire in Carnac. Here, my X dilemna was solved by me spotting the letter carved on one of the 5,000 year old rock carvings.

Roll on Y .....!