Yonaguni Monument:
These massive stairs and walkways that sit off the coast of Yonaguni, Japan, are the topic of controversy as people can’t decide whether or not it is man-made or a natural occurrence. These flat edges and perfect 90-degree angles seem to be manmade, but scientists believe that water currents have naturally cut these shapes out of the stones.
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.