This story appears in the September 2011 issue of National Geographic magazine. Perched on the edge of a cold, windswept dune in North Carolina, I was about to fulfill a dream I shared with ...

Everything you need to know about Leonardo da Vinci is contained in the work he did in the 1480s and 1490s for Ludovico Sforza — Ludovico il Moro, the Duke of Milan. And it’s in this capacity ...