Jerusalem Explored is a book by Italian architect and engineer Ermete Pierotti who worked for several years in Jerusalem as a consultant for the Franciscans. He was involved in archeological explorations and in this book he put down the knowledge he had gained during his work. The book provides a description of the ancient and modern city of Jerusalem, containing many photographs, drawings and maps, illustrating the manners of the ancient Hebrews. Pierotti's maps showed new, as yet unknown and unexplored canals in the underground of the Temple Mount. With the modern methods of archeology, these channels could also be detected.