Mona Lisa Smile

“How It Was: Secrets of Mona Lisa”
Tuesday, March 18, 8 p.m. ET/PT National Geographic Channel

With its enigmatic smile and piercing eyes, few faces have cast as deep or enduring a spell as that of Leonardo da Vinci’s Mona Lisa. This iconic painting has been adored and analyzed for half a millennium, but it remains shrouded in a cloak of secrecy. Space-age technology peers beneath its layers to solve mysteries surrounding its great master’s materials, methods and model. Can art historians, curators and computer experts surmise new information where so many others have been left puzzled? NatGeo world premiere