On Time Tangled Island, go to the Great Wall of China (6 o'clock, 1593 AD ). At the upper right, atop the scaffolds, you will play a memory game against the old man. When you win, you get Thor's hammer shaped amulet (for the Vikings at 2 o'clock, 831 AD).
(*you should also pick up the barrel of gunpowder at lower right)
The Thor's Hammer amulet is at the great Wall of China (1593) - climb to the upper right and beat the old man in a memory game.
you dont
@ the great wall...
inside a temple
The Vikings are at 831 AD (2 o'clock on the time device). They need Thor's Amulet. You will find it at the upper right of the Great Wall of China (6 o'clock 1593 AD). While you are there, get the gunpowder from the lower right. This will get you into the cave on the Viking island. (see related questions)
The pumpkin head is in Time Tangled Island and you have to find it.
I don't think there is one.
on time tangled island [vikings]
The cave is located in 0831 AD.
In the Aztec period, you get them from the warrior.
In "Time Tangled Island," you can find the gramophone in the 1920s area. It is located inside the house of the character named "The Inventor." You need to interact with the gramophone to play music and help solve the time-related puzzles on the island.
you find your self in the future(seconed time)