Magnificent Mansion housing National French Archives.
If you are interested in history, do not miss this fascinating and free museum : it displays some amazing historical documents such as letters written by Joan of Arc, Marie Antoinette, Voltaire, Robespierre, etc, etc.
Documents are housed in display cases with explanations of their significance and the place they held in nearly 1400 years of French history. However, they do rotate as they are quite fragile.
The temporary exhibits are a lot of fun as well : We saw the Guerre Des Moutons exhibit on the importance of the merino sheep in the 18th, 19th and 20th centuries, and the competition between different countries in times when wool was supremaly important.
Don't miss the period rooms (the museum was formerly the Soubise Chateau)
nor the indoors gardens : the front royal courtyard or the gardens on the right side of the mansion offer delicious moments of peace savoured by Parisians who picnic there during sunny days !