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.

The Taj Mahal is one of the world's most beautiful monuments, but new investigations reveal its dark secrets; scientists uncover codes that tell a shocking story of power and betrayal, challenging everything originally known about the Taj Mahal.