User blog comment:JAlbor/Wikia at E3 2012/@comment-121.127.192.233-20120530053904/@comment-4043223-20120530060010

Most cultures were aware of them in some way but it was more a basis of superstitious and religion rather than concrete information on TWCB. I wouldn't be surprised if the site of the grand temple turned out to hold some special significance to their ancestors and gods for the Native Americans in the game.