Imagine a place where digging into the ground almost instantly uncovers relics of war – bullets, bayonets and even mortar shells from World War II. That's the Wanjialing mountains in China's Jiangxi Province. Over 80 years ago, this was the site of some of the fiercest battles between the invading Japanese forces and the Chinese army. We went there to see what we could dig up – and what we found was a surprise.