The Palatine Chapel was built inside Palazzo dei Normanni of Palermo towards the middle of the XII century by Ruggero II of Sicily. It is an example of the fusion of different artistic traditions: roman architecture, byzantine mosaics, Arab ceilings. An extraordinary monument that deserved a deep analysis that only the collection Mirabilia Italiae can offer. Four colored volumes, two of Photographic Maps, one of Essays and one of Reports, gives the reader the possibility to explore the environment, to discover hidden details and the less known events of the Chapel. Thanks to a photographic campaign that lasted for more than a year after the restoration had terminated, a team of international scholars were able to see unpublished images and a very high standard of art works of the Chapel. Supervised by Beat Brenk, Art Historian and Architect, the authors of the volume have been able to write a series of interventions that represent the state of our knowledge of the Chapel, its story and its functions.