Too bad they did not allow visits the opera as they were in dress rehersal, we will return again though. Meanwhile, a little bit of history. Exponent of Czech cultural revival, was entirely destroyed by a terrible fire, and restored by the best artists in the country in the seventies and eighties. The front is adorned with neo-Renaissance allegorical figures while to the left there is a new arena of Karel Prager, a cube with exhibition halls. It reminded me very much of the Opera Garnier in Paris especially because of the five arches in the entrance.