Not really interested in musical instruments, but the Art Nouveau building is a delight from the outside, so I was curious to go in as well. The fun factor once you are in is that your audio guide plays the sound of the instrument you are looking at. A bit disappointed that the building from the inside has been altered and only very few original details remain. The fin de siecle lift is very busy so you need to be very patient if you want that experience also, Before you return your audio guide at the ground floor, make sure you visit the basement first where the mechanical instruments are displayed.
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