The Castello Plan is an early city map of Lower Manhattan (New York City) from 1660, created by Jacques Cortelyou, surveyor of New Amsterdam at that time.
Around 1667, cartographer Joan Blaeu bound the plan, together with other hand-crafted New Amsterdam depictions, to an atlas, which he sold to Cosimo III de’ Medici. This transaction most likely happened in Amsterdam, Netherlands, as it has yet to be proven that Blaeu had ever set foot in New Netherland.
The plan arrived in Italy, where it was found in Villa di Castello near Florence in 1900 and printed in 1916, thus receiving its name.
It is covered extensively in volume 2 of I. N. Phelps Stokes Iconography of Manhattan Island