Among the relics discovered at Sanxingdui were three incredible bronze masks, each the size of a piano. Who do they depict? And why do they have such exaggerated features? Experts believe the masks may have been used in ancestor worship.

Sanxingdui was a Bronze Age city that flourished 3,000-5,000 years ago in Southwest China. Sanxingdui was the capital of the State of Shu and is one of modern China's greatest archaeological finds.