The Unopened Emperor's Tomb
The main tomb of Qin Shi Huang remains sealed due to fears of deadly traps.
While the Terracotta Army is spectacular, the actual tomb of China's first emperor, Qin Shi Huang, has never been excavated. Ancient texts claim it contains a map of his empire with rivers of flowing mercury, and is protected by deadly automated crossbows. Scientists have detected high mercury levels in the soil, lending credibility to the ancient stories and keeping archaeologists at bay.