The Architecture Documentation Collection is the youngest in Salzburg Museum. The Salzburg architect Gerhard Garstenauer transferred his entire architecture archive to the museum in 2010, with the idea of collecting and preserving architectural works also of the twentieth and twenty-first centuries, and, most particularly, documenting building activities in the twentieth century. Thus, the designs, sketches, and plans of Gerhard Garstenauer form an important basic stock for the documentation of building in Salzburg in the last century and, together with seventeenth-, eighteenth-, and nineteenth-century plans kept at present in the Graphics Collection, provide an overview of more than 400 years of building activities in Salzburg.