Starforts

Starforts are buildings thought to exist previous to Columbus “discovering” North America. They are built using a level of sophistication that far exceeded the technology that was available back in the horse and buggy days, actually many of these buildings could not be reproduced today using our modern equipment.

I think that the neatest part about them is that the Starforts and other buildings (think churches and parliament buildings) are readily accessible to anyone who wishes to examine them.

A map of the world’s Starforts:
http://www.starforts.com/world.html