This book was published on the occasion of the exhibition presented at the Conciergerie, Paris, from February 15 to May 2, 2017. The Ile de la Cité is home to the Hôtel-Dieu, Notre-Dame Cathedral, the Palais de Justice, Sainte-Chapelle, and the flower market. However, this part of Paris remains a little known place, out of step with its status as a metropolis heart.