This book aims to serve as a key accessible to all, offering entry into, knowledge of, and understanding of one of Italy's most beautiful cathedrals: the Siena Cathedral. Thanks to the accessible and educational approach chosen by the two authors, Ilaria Bichi Ruspoli and Barbara Latini-both art historians and licensed tour guides-the Cathedral unveils its wonders and mysteries to the reader, who will be guided along the journey by detailed infographics and a previously unpublished photographic collection of high emotional impact. A journey that, among many marvels, winds through the intricate design of the floor, the beauty of the Piccolomini Library, the panoramic view of the city from the rooftops of the Gate of Heaven, Nicola Pisano's pulpit, the enigmatic sculptural decorations inspired by Egyptian and Greek motifs in the Chapel of Saint John, and the mystical atmosphere of the Chapel of the Madonna del Voto.