Archaeologists make a grim discovery when they uncover the remains of a mummified boy buried in the frozen Siberian landscape, and as researchers continue their excavation, they uncover 88 additional graves linked to a mysterious, ancient necropolis.

Climbers make a shocking discovery when they encounter the remains of two human bodies high atop New Zealand's Mount Cook. After a forensic investigation, a decades-old mystery reignites that could rewrite mountaineering history.