Saksaywaman:
These giant stones have been sitting just outside of Peru ever since the year 1100. Built by the Inca Empire, these massive boulders are particularly impressive because they fit perfectly together without the use of mortar. The stones together create a citadel just outside of the city of Cusco, Peru, the historic capital of the Inca Empire.
or they are respectful that not all religions utilize the same calendar...
"When in Rome..."
...I use my own d@$% calendar, and I expect everyone else to accommodate me!!!!!
Darwin has nothing to do with historical timelines.
https://en.wikipedia.org/wiki/Sacsayhuam%C3%A1n
What we're talking about is the Norse settlements leading to the settling of the North American continent. Greenland because of it's proximity to N. America is the reason it's included.