The Musical Instruments Museum Brussels - MIM. Rue Montagne de la Cour 2, Brussels 1000, Belgium. The museum is housed in the Art Nouveau building of the former Old England department store by Paul Saintenoy (1899). The view is over downtown Brussels, with the Arts Mountain, Mont des Arts or Kunstberg in the foreground. Directly behind there's the spire of the magnificent Town Hall on the Grand Place, the Central Market Square. In the distance the view is all the way to the imposing Basilica of the Sacred Heart or Koekelberg Basilica, one of the largest Roman Catholic churches in the world and the largest Art Deco building in the world. Views from the museum's top floor restaurant are even better.