The Great Wall of China is a time period on Time Tangled Island. It is where you will find the amulet for the Viking time period. To get it, you must win a game with the man on the wall of memory. You can also find some gunpowder which will also be used with the Vikings. You must climb up the wall and go to the soldier at the tower. He will tell you that he needs a stone bowl, which is found in the Lewis and Clark time period.