da Vinci's First Sketch

Leonardo da Vinci’s first known work ("The Hills of Tuscany") is from 1473 when he was 21 years old. The sketch is believed to be inspired by the Arno Valley where da Vinci grew up. Although da Vinci never published his geological theories, his works were geologically correct; he understood the geological processes that shaped our mountains and valleys hundreds of years before the public.

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