The book is about a journey from Constantinople to Poland by the Jesuit and scientist from Ragusa di Dalmazia Ruggiero Giuseppe Boscovich, published in 1784, and describes the journey he made in 1762 from the Ottoman capital through Thrace, Rumelia, Bulgaria and Moldavia to reach finally in Polish territory. The travel report constitutes a historical document of considerable interest, since it represents a rare and neglected direct testimony of Eastern European countries still little known to western travelers of the eighteenth century.