Stirling Castle in Scotland could be the home of King Arthur's legendary Round Table; scientists have made a gruesome discovery at this mysterious site; a disfigured skeleton that could reveal the castle's bloody secrets and rewrite the history books.

The Terracotta Army is one of China's greatest treasures, but there are still dark secrets surrounding this super-tomb; newly discovered artifacts reveal the soldiers' supernatural enemy, and human remains point to ancient China's violent past.