2 Things:
1. Duncan, you said "they" crossed the Atlantic in 1492. Correct, but we also have evidence that supports the fact that Leif Ericson crossed the Atlantic into Canada and modern Northern USA. Not a big deal, just wanted to sort that out.
2. Tom Bishop, can I ask how you got that picture? Obviously that picture is taken from an airplane or helicoptor. The guards at the Ice Wall would have shot that plane down and the pictures retrieved and destroyed. Just, how did you get it?