The Journées du Patrimoine (Heritage Days) take place on the weekend of September 16 and 17 for 2023! And if you want to get off the beaten track a bit, head for Houilles, in the Yvelines, to plunge into the heart of history with guided tours, workshops and original exhibitions. From Saint-Nicolas Church to the charm of the old stone quarries, discover the heritage treasures of this Yvelines town!