do you know about all of them?

This video lists 10 of the most awesome archaeological discoveries of all time.  Some of the discoveries on this list you may or may not have heard of before.  Apparently there are about 300 enormous stone spheres in Costa Rica…did you know about that?  And how in the heck did they get there?

Or what about the huge stone structures in Tiwanaku in Bolivia?  Most conventional theories would attribute these to local civilizations, although it would be quite difficult to build many of these during those time periods.  There are a lot of different theories on that one in particular.

As is expected, some of the comments on this video thread are very spirited and interesting.

Commenter BT had this to say about one of the strange and incredible discoveries in the video:

Those stone spheres really freaked me out because our TARGET stores have those in front of their entrances. Were they formed by Aliens? They had to be because they are too perfectly round for Target Employees to have made them. It is really scary because you have to walk past them as you enter and exit the store not knowing if they are monitoring you or if they are going to explode. Really strange.

300 strange stone balls?  Seriously what could have made those?  Just the local civilization or something else?

We hope you enjoy watching the video.

Feel free to comment with your theories.