(Last Update: 03.06.2025) If you ask me what the most important events in Paris excite me, I will undoubtedly say that one of them is Journées du Patrimoine - Cultural Heritage Days. Within the scope of this event, which is held every year in mid-September and should not be missed, countless government institutions, palaces, museums and many monumental buildings that you would not have the chance to visit in normal times open their doors to visitors.