What's inside Leonardo da Vinci's notebooks? Packed with intricate sketches and detailed notes, Leonardo's personal diaries reveal his countless passions—from the structures of human anatomy to Leonardo da Vinci—architect, inventor, scientist and painter of the 'Mona Lisa' and 'The Last Supper'—was a major figure of the Italian Renaissance. 156K views 5 days ago. New. Stay up to date on all of HISTORY's latest premieres at to Ancient Astronaut Theorists, Leonardo da Vinci encoded secret Leonardo da Vinci Italian artist, engineer, and scientist Cite External Websites Written by Ludwig Heinrich Heydenreich Director, Central Institute for the History of Art, Munich, 1947-70. Author of Leonardo da Vinci; Leonardo architetto. Ludwig Heinrich Heydenreich Fact-checked by The Editors of Encyclopaedia Britannica A5LS6py.