Weird how history is all around us all the time, as I was just very recently in a Thyssen Krupp elevator in a library building. Stairs are better for you anyway ;-)
Stumbled on to this obscure story by pure accident, and further reading (the second link) is very interesting. The story of the massacre is a fairly confusing one, almost a little bit of a whodunit... My wife still doesn't believe me when I tell her "I'm a historian" now, in addition to being a collector (it's kind of a chicken and egg, what came first thing, isn't it?).
What it really means is I spent twice as much time on this as I should, some to find items, and some to learn more.
I found all this fairly interesting, wanted to share it here.
The Batthyany Conspiracy: All Innocent On The Eastern Front | David R. L. Litchfield
The Thyssen Art Macabre | David R. L. Litchfield