The Gate of the Sun:
Situated near Lake Titicaca and built somewhere around 500-950 CE, this archway was carved out of a monolith. It comes equipped with beautiful and intricate carvings that are thought to represent an early form of astrology. When it was discovered by explorers in the 19th-century, it had been toppled over and had a crack in it. Today, it stands where it was discovered- however, some people believe that where it is now wasn’t its original location.
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.