After the visit and seeing and climbing the very large earth pyramid I used the sun to plot an east west line in my driveway. Knowing that, I laid out a perpendicular and had a perfect north south line. It is easy. Once you have the cardinal points, determining the equinoxes and the solstice becomes easy.
Monks Mound is laid out precisely in alignment with the cardinal points. From the Woodhenge center pole looking east the alignment of the mound south edge is barely to the right of the top edge of the mound. It marks the summer solstice sunrise. It misses the edge by an angle representing the latitude!
Cahokia is readily available........ go! PS: At the time Cahokia was larger than London and most european cities. Greater Cahokia was estimated to be 25,000 people
I'd certainly like to do so.
It is believed by many that Nordic expeditionary tribesmen and settlers traveled extensively through North America and left evidence of their arrival as far away as Oklahoma.
It is certainly reasonable to propose that Vikings c. 900 - 1000 AD who made it to what eventually became Minneapolis/St. Paul would have traveled southward to what became St. Louis and left evidence of their presense at a place called Cahokia.