Holborn Viaduct, London, UK

Holborn Viaduct, London, UK

A historic bridge located in London, built between 1863 and 1869 and designed by engineer William Heywood, was one of the most ambitious and costly engineering projects of its time. Not only does it connect Holborn and Newgate Street, but it also spans Farringdon Street and the underground Fleet River. 1400 feet long and 80 feet wide, made of cast iron, supported on granite columns. Design and construction were considered engineering feats at the time, not only improving the city's traffic flow, but also an important symbol of modern Victorian era London. It is also considered by some to be the world's first overpass.