The craving for the unknown has always been inherent in man - both at the dawn of our civilization, and in the Middle Ages, and today, when there are still a lot of questions, and answers do not always come immediately. This installment of the NNN series consists of two books in which we tried to ask and answer questions - albeit not all, but only some. Much remains unanswered. It is up to our descendants to find the keys to the secrets of bygone eras.