Hitler performed the first ceremonial shoveling of dirt on September 23, 1933, at Frankfurt, and work officially began simultaneously at multiple sites throughout the Reich the following spring. The first finished stretch, between Frankfurt and Darmstadt, opened on May 19, 1935, and the first 1,000 km (620 mi) were completed on September 23, 1936. After the annexation of Austria, the planned network was expanded to include the Ostmark, and a second sod-breaking ceremony for the first Reichsautobahn on formerly Austrian territory took place near Salzburg on April 7, 1938.