I recommend that all of that be taken with a grain, no a large chink, of salt. It is certain that most if not all of the pre-Columbian stonework in the northeast was built by the American Indians, and while it it is likely that some European blood ran in the veins of the eastern Indians, myths of Celts and other Old World groups having longstanding separate civilizations on the North American continent before Columbus have little basis other than some people's deep-felt longing that they were true.
Some of this is based on the supposition that the Celtic peoples built Stonehenge and other megalithic monuments, something we know not to be true.
Something is not right. This message is just to keep things from messing up down the road