The famous Welsh passage tomb might not be as recognisable as Stonehenge, but it possesses a similar alignment where the stones line up with the sun on the longest day of summer.
Efallai nad yw’r beddrod cyntedd mor adnabyddus â Chôr y Cewri (Stonehenge), ond mae iddo aliniad tebyg, lle mae’r cerrig yn alinio gyda’r haul ar ddiwrnod hiraf yr haf.