As Ray Monk has noted, Karl Wittgenstein’s ‘immense wealth enabled the family to live in the style of the aristocracy. Their home in Vienna, in the ‘Alleegasse’ (now Argentinergasse), was known outside the family as the Palais Wittgenstein, and was indeed Palatial, having been built for a count earlier in the century.’ (Monk, 1991: 8). Completed around 1873 in Vienna’s 4th district, it was a magnificent Neo-Renaissance mansion that hosted performances by such  composers as Johannes Brahms and Gustav Mahler. Though it miraculously survived World War II, it was unfortunately demolished in the 1950s during post-war modernisation and has since been replaced by a modern residential apartment building with no remaining traces of its opulent past.