The human tale is in the families that lived and entertained within those walls. Most of us know the history and I am sure there will be little "tourist friendly" plaques with small bites of info for those that do not.
I actually can not imagine what the offering for artifacts will be that you can hold in your hand, if any.
Bored tourists are boring... tourists. They are the ones the velvet ropes are for.
True, there may not be much for you to heft or hold. Regardless of what those walls are finished with, try to see each room in how it catches the light of the day and let your ability to imagine do the rest. Don't be forlorn, be open. Can't help you with the fact there may be some minor electric run for practical reasons.
You don't think the prior owners would have dug a few lights and maybe a mean Bose system for those parties they threw? Don't kid yourself.
g.