Genghis Khan encountered obstacles

In the 13th Century,Genghis Khan embarked on a mission to take over Eurasia,swiftly conquering countries and drawing them into his expanding Mongol Empire.With his vast armies he became almost unstoppable.But, legend has it that there was one obstacle that even the impressive Khan couldn't overcome:A towering wall of ice,grown by locals across a mountain pass to stop the Khan armies from invading their territory.