The Rocking Stones | Visit Rhondda Cynon Taf, South WalesThe Rocking Stone or "Y Maen Chwyf" in Welsh is a glacial boulder remaining from the Ice Age.Rocking stonesHome > Things to do > History and Heritage > Myths, Legends, Heroes & Stories > The Rocking Stones The Rocking Stones The Rocking Stone or "Y Maen Chwyf" in Welsh is a glacial boulder remaining from the Ice Age. It formed the central point https://www.rctcbc.gov.uk/EN/Tourism/Thingstodo/HistoryandHeritage/MythsLegendsHeroesStories/TheRockingStones.aspx