Palace of Ludwig Viktor
Innere Stadt, Austria
The Palais Erzherzog Ludwig Viktor is one of the best known Ringstraßenpalais in Vienna. It was built between 1863 and 1866. The first building to be built on the Schwarzenbergplatz, it is now a subsidiary house of the Burgtheater.
Palace data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).