While in Milan, Leonardo da Vinci came up with his idea and began plotting the Treatise on Anatomy. In Milan Leonardo met the anatomist Marcantonio della Torre, a proffessor at the Pavia Medical school. One of the most important discoveries of Leonardo in Milan was Leonardo's advancements in embryology. On a cadaver Leonardo was able to expose a human fetus which allowed him to make many discoveries. He correctly identified the position of the fetus and discovered a variety of things about the placenta.

The Royal Collection at Windsor Castle holds around 550 pieces of Leonardo's work. The Castle itself is owned by the British Monarchy and is currently occupied by the Queen of England. It was originally created by William the Conqueror. Peices of Leonardo's Treatise on Anatomy, including the depiction of the Fetus in the Uterus are held here. After the death of Leonardo, the works of the Treatise on Anatomy were lost until they were discovered in the Royal Collection at Windsor Castle in the 18th century.

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Fogelsville, Pennsylvania is a city in Pennsylvania where the nonprofit organization called Leonardo da Vinci's Horse Inc was founded by Charles Dent, the retired Pennsylvanian airline pilot. A model of the horse statue that Leonardo da Vinci originally designed was created in Fogelsville and then delivered to the Tallix Art Foundry to be approved. Years later, and after changing the model significantly, work on the horse statue began.