+43°39'19"N , +75°27'42"W
It is a location in New York by the Canadian border by a town called Turin.
The artifact Shroud of Turin was mentioned in AC2. It's another Piece of Eden... Apparently it can revive the dead and heal the wounded but with side effects (Lucy?)
Also, at the end of The Da Vinci Disappearance the people you hear while Desmond is in a coma say they found the temple. So, either the Assassins or the Templars got Desmond, I say the Assassins, since you hear the name William during the DLC, who is another Assassin that Lucy is emailing throughout Brotherhood.
Here's the whole page on it if anyone wants to read up, its rather lengthy.
http://assassinscreed.wikia.com/wiki/Shroud_of_Turin
Hope we visit South America in one of the games to get the Crystal Skulls (also Pieces of Eden)