Huh, I didn't know about that one. The picture shows a building that's a bit, um, weathered. Wiki says the interior was designed by a couple of the Bibienas (big name in 18th-century scene design). I went googling and found lots of pictures like this one:

And that's just an exit. The Bibiena family firmly believed that no inch should go unornamented.

Come to think of it, it's not likely performances would be scheduled in the Festspielhaus during reconstruction. Wolfgang Wagner said the building was going to fall down if something wasn't done soon; maybe they're still trying to raise the money.