I believe America was visited by others before Columbus. I’ve read that the Indians in the northeast were different from the western Indians.
In New England there are Mystery place... such as Gullywamp (sp)Near Groton, CT.
Oooooh! good one!
http://www.damnedct.com/gungywamp-groton
http://www.damnedct.com/wordpress/wp-content/uploads/2008/12/gwamp4.jpg
Or, as the old saying goes, colonial root cellar my ass.