The Pont du Gard was built shortly before the Christian era to allow the aqueduct of Nîmes (which is almost 50 km long) to cross the Gard river. The Roman architects and hydraulic engineers who ...

This article was originally published with the title “ Fell's Railway over Mont Cenis ” in Scientific American Magazine Vol. 20 No. 24 (June 1869), p. 371 doi:10.1038 ...