The City of Vienna was one of Austria's most developed locations. As the former capital of the region, its importance was second only to Kufstein, where the Kaiser and his family resided. As a result of this, much effort had gone into producing a large and functional city with all the modern wonders that existed in the Kingdom's capital.
The leaders of the world's most prominent states were all gathered in this city. After signing and ratifying the Vienna Accords, they were free to explore the city. Zhu Wudi, among many others, took this opportunity to see just how powerful the Germans really were.
The Ming Emperor, like many of his counterparts, was utterly surprised, and albeit a bit terrified by the ability to fly in the air. The Germans accomplished an ancient dream that had long since been deemed impossible by the rest of the world. This was more than enough to show how distant their two realms were in terms of technology.