Fascinating!
Let me be right up front about this. If you are not into Habsburg history, you probably will not find this interesting. But, I would trust that before traveling to this City that one would have done their homework about the many sites to see.
It's quite impressive seeing the sarcophagus' of Kaiser Franz Joseph, His Kaiserina Elizabeth and their only son Crown Prince Rudolph that died in a still unsolved mystery!
If this does not interest you - you will waste your time, when there is so much to see and do in Vienna!!