Once you get the gunpowder, you have to go to the vikings time. You find the first cliff looking thing, and jump on the ledges. Once you're at the top with a bunch of rocks, you click on the rocks and the gunpowder will burst them open, and you'll see a cave with a burning torch in it. Enter it, then find your way through the cave, 'til you get the Roman vase. You have to hurry though, because the torch doesn't last long.
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.)
I'm guessing you mean why it was not used for defense or weaponary. The answer is that the Chinese did not find a weaponary use for gunpowder, they used it mainly for fireworks. The Europeans were the first to use gunpowder for weapons.
There is a barrel of gunpowder to the right at the Great Wall (1593 AD), to use at the rocked-in cave in 831 AD. (When you have it, you only have to click the rocks.)
The gunpowder from the Great Wall of China (1593 AD) is used to blast open the cave at 831 AD, which is blocked by rocks. (see related question)
There is a barrel of gunpowder at the Great Wall of China (1593 AD). You can use it to blast open the rock cave at the Vikings island in 831 AD. One you have the gunpowder, click the rocks to blast them open.
Much of it is still standing. It is not longer in use as a defense against invasion.
The Great Wall of China no longer serves its original military purpose, but it is a tourist attraction, so in that sense it still has a use.
No TNT, but some gunpowder that will work. Go to the Great Wall of China (1593 AD) and get the barrel of gunpowder at the far right. You can use to to blast open the cave at 831 AD to recover the Golden Vase.
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 great wall of china is not in use because the have no more enemy at this point
There is a barrel of gunpowder to the right side at the Great Wall of China (1593 AD). Use it to blast open the cave at 831 AD (Vikings island).
Ancient Romans did not use gunpowder. Gunpowder was invented by China around the middle ages.