If your wanderings through the world by chance lead you in the valley of the river Rhine (Ger., Eng.) you should visit the nice city of Strasbourg (Ger., Eng.) in the Elsass (Ger., Eng.), because until the 12th of February an interesting exhibition is shown in the Museum of Modern and Contemporary Art there: Europe and the Spirit World, or The Fascination with the Occult 1750-1950. Or, if you can not see it (like me), there is always a catalogue in reach via your next library.