Grand palaces of culture, opera theaters marked the center of European cities like the cathedrals of the Middle Ages. As opera cast its spell, almost every European city and society aspired to have its own opera house, and dozens of new theaters were constructed in the course of the "long" nineteenth century. At the time of the French Revolution in 1789, only a few, mostly royal, opera theaters, existed in Europe. However, by the turn of the nineteenth...