The cave at 831 AD is covered by rocks. Get the barrel of gunpowder from the right side of the Great Wall of China in 1593 AD. Clicking on the rocks will automatically set off the gunpowder and open the cave.
(see related question)
Go to China ( place with the big gray wall being built ) and run to the right until you see a the gunpowder barrel on a platform .
What game has a barrel to get into? The only one that really uses barrels are Time Tangled (gunpowder) and Nabooti (which has leaky barrels of explosives). (FYI : at the diamond mine, you can turn off the sparking switch so you don't blow yourself up.)
on time tangled island [vikings]
take it to the vikings and climb up the mountain till u get to the cave with rocks in front of it, click on the pile of rocks, and the gunpowder will blow the rocks away.
On Time Tangled Island, click on the crab several times until he explodes. (Not to worry, he rapidly pulls himself back together.)
where the Vikings are get on top of hill and blow up rocks
You don't blow up any walls in 1593 AD. Pick up the gunpowder and use it to blast open the cave at the Viking time (831 AD). Once you have the gunpowder, just click on the rocks to use it. The Thor's Hammer amulet is also at the Great Wall, at the upper right, where you must beat the old man at a memory game.
If you click on him repeatedly, he will explode, then come back together.
Gunpowder can blow things and people up.
you go into the cave in the time of the Vikings and blow up the rocks with the gunpowder in the Chinese time you take a little flame next to the cave go in and at the bottom of the cave is the jar
In the stone wall you get the you get the gun power to blow up rocks to get in the cave to get the tem inside and you need to beat a memory game to get the amulet for the vickings
The one in the Viking Time It's a rocky place and easy to see