This book chronicles the life and work of Fulgence Bienvenüe (1852-1936), the engineer who designed and constructed the Paris Métro. Drawing on rare photographs, sketches, and drawings, the author traces Bienvenüe's career from his early days in Bordeaux to his pivotal role in developing one of the world's most iconic subway systems. The narrative explores the technical challenges, political obstacles, and urban planning considerations that shaped the Métro's expansion across Paris in the late 19th and early 20th centuries. Through detailed archival research, the book illuminates how Bienvenüe's engineering innovations transformed urban transportation and influenced city development. The rich visual documentation provides insight into the construction methods and infrastructure that defined modern Paris.