This document provides an overview of the history and significance of the architectural drawings collection at the Cooper-Hewitt Museum. It discusses how the collection was formed through major purchases and donations, positioning it as one of the most important architectural drawings collections in the world. Specifically, it summarizes how the core of the collection came from the personal collection of Giovanni Piancastelli, an Italian architect and collector, who sold over 4,000 drawings to the founders of the Cooper-Hewitt Museum in the early 20th century. The document also highlights some key drawings in the collection and their historical importance as examples of architectural draftsmanship and perspective techniques over time.