The gunpowder is at the Great Wall of China (1593 AD, 6 o'clock on the time device). Pick it up at the right side. You will use it to blast open the cave blocked by rocks at 831 AD (2 o'clock on the time device). To use it, just click on the pile of rocks.
You have to be fast once you're in the cave because your torch will burn out. Run down, up, up, up, across, down and left and jump the three puddles at the end. You will find the golden vase for Ancient Greece (1 o'clock 328 BC).
sorry but its impossible
@ the great wall...
The gunpowder is in China (1593 AD), by the wall to the right.
The only place where the gunpowder can be used is at the Viking island at 831 AD. There is no other location on the island that requires explosives.
You go to the guy who wants the smoke bowl and on the other part of the place should be gunpowder on bricks.
The gunpowder is to blast the rocks blocking the cave entrance at the Vikings time (831 AD). The gunpowder is at the Great Wall of China (1593 AD).
Get the gunpowder from the Great Wall (1593 AD) and then click on the rocks.
Except for the barrel of gunpowder on Time Tangled Island, the barrels on Poptropica are entirely decorative, or for jumping on.
To open the cave at 831 AD, get the gunpowder from the Great Wall of China.
Go to the Great Wall of China. Head right and you will see a barrel of gunpowder.
The barrel of gunpowder (lower right at the Great Wall of China, 1593 AD) is used to blast open the cave at the Viking island at 831 AD (2 o'clock on the time device).
When you have the barrel of gunpowder from the Great Wall of China (1593 AD), you can just click on the rocks at the cave (831 AD) and they will be blasted away.(There is no USE on the gunpowder.)