COVE

Also known as “Landscape with Waterfall” and “Landscape with River,” this is da Vinci’s earliest known work, dated to August 4, 1473.  It’s considered one of the first realistic landscape-views, due in large part to da Vinci’s own observations. The drawing is geologically correct: thin at the bottom and thick at the top, like the Turbidite sequences found in the Apennines Mountains.