…having discovered America.
When you go for a run through the woods in Ober Olm, you’d think that there was significant duplex peripateticism at the time.
How else does one explain away this Pawnee (I’ve checked – Navaho and the res t of them used a different construction technique) tipi?
Mainz Daily Photo 
Well, there’s an established Viking archaeological site today called L’Anse Aux Meadows up in Newfoundland, so that certainly proved they were over here, among other finds that have been made.