Poptropica Time Tangled Cave. Before time tangled was released, it was referred to as time lapse island, then later as time twisted island. The gunpowder can be found in the great wall of china (1593 ad) time period of time tangled island.
Time tangled is a really fun island. Walk to the right and there will be a building that says party time tower. When that happens, jump and land on them.