The Tomb of China’s First Emperor was first discovered in 1974 by farmers, and it became one of the largest discoveries in history. The famous terracotta army was excavated from the find and nearby is the tomb buried underneath a hill. But whatever is inside remains a mystery as archaeologists refuse to excavate the site. First, legally China won’t allow it due to science not being able to preserve the site well enough. But, also, it’s life-threatening. It’s said in historical documents the tomb has a river of mercury surrounding it and soil samples prove this to be true. To date, the site remains a prominent mystery that might not be solved for some time.