The Norse voyagers discovering Vinland were thought to be myths until the discovery of L'Anse aux Meadows, Newfoundland.
Dana Olson, 59, of Jeffersonville, Ind., has also investigated the story and wrote a popular book, Prince Madoc and the White Indians.
Olson's interest began when he was researching another book and discovered a stone fortification near Falls of the Ohio, Ind.
Olson went on to discover numerous other forts in Tennessee, Missouri and Alabama said to be similar to forts built in Wales.
"The physical evidence supports the recurring theory that the Welsh voyager penetrated far into the interior of America where he established a chain of fortifications and stoneworks that still exist today.
Then there id the Uluburun wreck that had Michigan copper in its hold. The wreck dates to 2500 bc.
I heard it first somewhere else.
The cogs and barges of Western Europe were only made for shallow coastal waters. They would stand no chance in open ocean, and couldnt have made it at all without going down to Africa to find favorable winds.
Siberian nomads were most probably the first somewhere between 17000 and 13000 B.C.