  Vienna today is one of the capitals for the research on foundations of
quantum physics. In this paper we reconstruct the main historical steps of the
development of modern physics in Vienna, with an emphasis on quantum
foundations. We show that the two main intuitive reasons, namely the influence
of E. Schr\"odinger and the initiatives of A. Zeilinger in more recent years,
cannot alone be held accountable for today's outstanding research landscape on
foundation of quantum mechanics in Vienna. We instead show that the connection
between physics and philosophy in Vienna always had an exceptional strength,
and that this played a major role in establishing the prolific field of quantum
foundations.
