As far as owning a piece of history goes, this prison cell door, from Robben Island - the institution infamous for the incarceration
Nelson Mandela - is about as good as it gets. The cell door is still in the same condition it was when it was removed in 1996, and may even have imprisoned Mandela himself!
So, I hear what you're saying, "what am I going to do with a prison cell door?", but clearly ...