Opera Houses Around The World

In a traditional opera house, the auditorium is U-shaped, with the length of the sides determining the audience capacity. Around this are tiers of balconies, and often, nearer the stage, are boxes (small partitioned sections of a balcony).
Since the latter part of the nineteenth century, opera houses generally have an orchestra pit, where a large number of orchestra players may be seated at a level below the audience, so that they can play without overwhelming the singing voices. This is especially true of Wagner's Bayreuth Festspielhaus where the pit is almost completely covered.