This is a very interesting museum dedicated solely to the history of Paris: paintings and models showing Paris through the ages, sculptures, archeological finds, old street signs, entire rooms of destroyed hôtels reassembled... but what really is unique is their collection of memorabilia related to the French Revolution.

A proper visit would easily take the whole day but we can just pop-in for one hour during our walking tour of the Marais and you can go back on your own (it's easy to go in and out as you want because the entrance is free!).