Paris - the City of Lights, opens its most secret doors through three films that take us behind the scenes of the most famous monuments of Paris. From the gargoyles-topped heights of the Cathedral of Notre-Dame to the alcoves of the Sacr+â-¬-C+ôur Basilica in Montmartre, and to the gigantic iron arches of the Eiffel Tower: learn all the secrets and history behind these three mythical places from those who look after these romantic structures. THE EIFFEL TOWER: The history and unknown challenges faced by Paris' most famous landmark are explored - how the height, the limited space within the tower and the presence of visitors 365 days a year, impose constraints on all those who work there. THE HEART OF NOTRE DAME: Unfazed by the incessant flow of tourists, the "cathedral family" at Notre Dame carry on with their daily duties 365 days a year, including over 1000 annual celebrations and concerts. MONTMARTRE: The Montmartre hillock has always cultivated its singularity. Renoir, Picasso, Satie, Bruand... the list who have created there never ends. But do the new inhabitants fit with the old bohemian?