Gothic cathedrals, as mysterious as the pyramids of Egypt or the statues of Easter Island, preserve in the heart of their majestic ships secular secrets that modern man has not yet managed to decipher. Cathedrals are there - before our eyes, in our beloved old Europe, in places frequented daily by tens of thousands of visitors - to tell us about our past. How were they built? Why does its architectural arrangement refer us to the medieval esoteric and symbolic universe? What is the secret of the meridian lines? This work, written by a specialist in the history of the Middle Ages and in esoteric studies, traces for us the epic of the construction of cathedrals and gives us the key to its symbolic and magical references. This exciting guide, which is both an introduction to European history and a study of religion and medieval esotericism, will also allow us to visit the most beautiful cathedrals in Europe at our own pace.