What happens at the Louvre Museum when it is closed to the public? During the Grand Louvre extensive renovations, the museum opened it's corridors to a film crew for the first time. People are seen moving paintings and reorganizing rooms. Miles of underground corridors and galleries cross each other. Little by little, the secret, and sometimes comical, mundane, sublime and fascinating world of one of the most famous museums in the world is revealed. A veritable city within a city opens it's heart to us.