In 1857, Emperor Franz Joseph I of Austria issued the decree "I have resolved to command" ("" at Wikisource) ordering the demolition of the city walls and moats. In his decree, he laid out the exact size of the Ringstrasse, the new representative boulevard, as well as the geographical positions and functions of the new buildings. Hohenlohe was responsible for buildings and properties of the Royal Court along the Ringstrasse as well as the completion of the Hofoperntheater, and the new construction of the Hofburgtheater and of two new museums, the Kunsthistorisches Museum and the Naturhistorisches Museum. The construction of the Neue Burg at the Hofburg was not completed until the First World War. Hohenlohe participated in the development of the Wiener Prater where the World Exhibition took place in 1873. The Konstantinhügel in the Prater is named after him. Hohenlohe also oversaw work for the Vienna Danube regulation.