Garabit Viaduct, Massif Central, France, Oct 2019

Viaduc de Garabit by engineer Léon Boyer and architect Gustave Eiffel (yes, same one who did the Eiffel Tower) was built by 400 workmen during 4 years. This railway arch bridge over the river Truyère opened in 1885, is 564 m in length, 122 m in height and has a main span of 165 m. To build it they used 3.249 tons of metal, 678,768 rivets and 38 tons of paint. The first picture above has over 199.400 views on Google Maps.