The Kunsthistorisches Museum is an art museum in Vienna, Austria. Housed in its festive palatial building on Ringstraße, it is crowned with an octagonal dome. The term Kunsthistorisches Museum applies to both the institution and the main building. It was opened around 1891 at the same time as the Naturhistorisches Museum, by Emperor Franz Joseph I of Austria-Hungary. The two museums have identical exteriors and face each other across Maria-Theresien-Platz.