Man's lasting contribution to an otherwise natural landscape. The grade II listed Martholme viaduct opened in 1877 and was built to carry the Great Harwood Loop of the East Lancashire Line over the River Calder until the section closed in 1957. The line was demolished beyond the structure, and whilst the path over the viaduct doesn't lead anywhere it's always nice and all too rare to be able to walk across one of these sleeping giants.