I would highly recommend the walking tour of the inside of the opera house. This tour was magnificent. The lady showing us around was a former performer herself and was incredibly knowledgable of the inner workings of the opera house, as well as the history of ballet and opera within the city. To see behind the scenes of a working opera house, with backstage, costume making and more was a real treat. The architecture and explanation thereof was very interesting and inspiring. I would highly recommend this tour. (We also saved almost 1/3 off the price of a book in a subsequent purchase in the gift shop with our tour sticker, which is worth knowing!).