How about stonehenge and the druids, ties into King Arthur from Wiki
Stonehenge is also mentioned within
Arthurian legend.
Geoffrey of Monmouth said that
Merlin the wizard directed its removal from
Ireland, where it had been constructed on
Mount Killaraus by
Giants, who brought the stones from
Africa. After it had been rebuilt near Amesbury, Geoffrey further narrates how first
Ambrosius Aurelianus, then
Uther Pendragon, and finally
Constantine III, were buried inside the ring of stones. In many places in his
Historia Regum Britanniae Geoffrey mixes British legend and his own imagination; it is intriguing that he connects Ambrosius Aurelianus with this prehistoric monument, seeing how there is
place-name evidence to connect Ambrosius with nearby Amesbury.
According to Geoffrey of Monmouth, the rocks of Stonehenge were healing rocks which Giants brought from Africa to Ireland for their healing properties. These rocks were called The Giant's Dance. Aurelius Ambrosias (5th Century), wishing to erect a memorial to the nobles (3000) who had died in battle with the Saxons and were buried at Salisbury, chose (at Merlin's advice) Stonehenge to be their monument. So the King sent Merlin, Uther Pendragon (Arthur's father), and 15,000 knights to Ireland to retrieve the rocks. They slew 7,000 Irish. As the knights tried to move the rocks with ropes and force, they failed. Then Merlin, using "gear" and skill, easily dismantled the stones and sent them over to Britain, where Stonehenge was dedicated. Shortly after, Aurelius died and was buried within the Stonehenge monument, or "The Giants' Ring of Stonehenge".