Per the official website for Monaco:
This summer the Grimaldi Forum, Monaco largest and most versatile event space will showcase three centuries of historic European monarchies with The Magnificence and Grandeur of Royal Houses in Europe exhibition. From July 11 through September 11, 2011, this one-of-a-kind event will provide visitors with a unique glimpse into the imperial homes of Europe’s most powerful and respected leaders and couples.
Never before seen as a collection, more than 600 artifacts will be on display within 2,500 square meters, providing a true ‘tour of Europe,’ which will allow visitors to explore the lives, roles and passions of personalities and couples who have marked the history of their dynasties and their countries.
Royal houses represented include Denmark, Spain, Luxembourg, Sweden, Norway, Belgium and much much more.
To read more about this exhibit and the other royal houses, past and present, represented in this exhibit please click the link: Visit Monaco
So, if you happen to live in the area or will be visiting the South of France and/or Monaco check out the exhibit if you can.
Source: Visit Monaco