Well, if it is BS, then it is very good BS, as nothing beats physical evidence.
You wont find this stuff discussed much in schools, and it is largely removed from mainstream attention becuase it poses "inconvenient" threat to the already hidebound and much accepted common histories.
But any historian will be the first to admit that our grasp of history is imperfect. We must be ever willing to accept evidence as it comes, rather than to dismiss or suppress it.
Here is an interesting link. You will note that there is Celtic writing from the 100 BC or so to be found in New England and other places in North America, as well as the archtypical "beehive" chambers so much associated with the Celts of Ireland. http://www.viewzone.com/ogam.html http://www.stonehengeusa.com/http://www.viewzone.com/ogam.html http://www.uptonmass.com/chamber.shtml http://www.s8int.com/page38.html
Americas stonehenge, and the Upton chambers are only the tip of the iceberg in the physical evidence that abounds which gives proof that there were Europeans here long before the Vikings or the Columbus led colonizations.
Take special note that the first two links are pretty credible and the sites are open to visitors. You can even go there and see for yourself if you so desire, it is open to the public. Also, take note that certified, actual university archeologist (Dr Barry Fell, of Harvard University) have confirmed the presence of Iberian Punic (Carthoginian) script, as well as Ogam (Irish ) script on the site. The ancient association between the ancient Celts and the Phoenecians is well established.
And so we see it even on American shores. This is evidence beyond question that there were Europeans here long before Columbus. BTW, this may have been how St Brenden knew to come to the Americas, because there had been others who had come here from Ireland before him?
This is not to belittle the achievements of either the Vikings or Columbus, but they were not the first. In fact, the Vikings didnt get interested in exploring the western sea until after
they started raiding the Irish monasteries, such places as Armagh and Devinish, where the ancient knowledge would have been kept. Is this how the Vikings first learned an inkling of something being out there? We can only guess at that.
But,we must always have open minds to understand two things of great importance about early AMerican history.
First, America was never truly lost, but the knowledge kept by a select few in the old world. And
Secondly, the natives in America were not ignorant savages who lived like cavemen until the Europeans came and lifted them up into civilization. The ancient natives also had stories of the old world. But they chose to reject the old world with its constant suppressing of the human spirit.
The natives in America wanted to live free and closely to nature. Thus, they were not totally ignorant of the Europeans (not the keepers of the secret knowledge), they just rejected it a long time ago.