For a fun afternoon in Vienna, nothing will beat the Haus Der Musik. For those with and without musical prowess, this music museum-cum-musical playground allows you to explore the science and history of music without the need for a PhD.
See the colour and shape of your voice, play giant instruments or even conduct a virtual orchestra - a museum with a difference, definitely.
Seilerstätte 30, A-1010, Vienna
www.hdm.at/en/2.htm
Google map: tinyurl.com/ly8cdo