A viaduct full of history 😮 The Cefn Coed viaduct, which can now be walked or cycled over, once carried the Brecon and Merthyr Railway. Boasting an outstanding look at the Brecon Beacons, there's even a stunning view of Cyfarthfa Castle. #BestofWeathermanWalking #iPlayer #Viaduct #Railway #Brecon