(Photo 5 © Adam Ogden, photo 6 © Stephen Prior)

Hewenden Viaduct comprises 17 arches and is 376 yards long. At 123 feet high, it's one of the tallest in Britain. It's reputed that shifting sands forced builders to dig its foundations much deeper than anticipated and the pillars stand as deep in the ground as they do above it.

Grade 2 listed, Hewenden now has a tarmac top and forms part of the Great Northern Trail footpath.