There are links though that the Romans missed. The folk traditions belonging to the peasants, for instance. As it was the peasants that pushed and shoved the stones there are reasons to believe that that tradition may have survived. (It's what I claim to have).

I've seen the new druids at Stonehenge and don't have too high an opinion really. But then, among friends, I would describe this gathering as Electric Druids - with apologies to S. Hillage.

According to the Annals the Druids were still around in Ireland until at least the 5th Century, but probably held on 'til much later. Patrick had a magic contest with the chief Druids of king Laoghaoire in the 5th century. St. Brigid is said to have been the daughter of a Druid and to have attended a druidical school.

It was not until Rome got involved in the 12th Century that the last of the Druidical rituals and beliefs were removed from the Irish church. Well, actually, they're still there, but that's a whole different issue.

Schools of learning that were separate from the Xtian institutions still continued into the 17th century, such as O'Davoran's Law School at Cahermacnaghten in county Clare. These institutions were the last echoes of a long dead religion.