Hengoed Viaduct - Credit: Wikimedia Commons
Hengoed Viaduct is a disused railway viaduct located above the village of Maesycwmmer, in Caerphilly county borough, South Wales. Grade II* listed, it was originally built to carry the Taff Vale Extension of the Newport, Abergavenny and Hereford Railway (NA&HR) across the Rhymney River, and is now part of National Cycle Route 47. Read more on Wikipedia
Source: en.wikipedia.org