While tourists flock to the Llyn Peninsula in the summer for its seaside charms, Porthmadog retains its industrial heritage, based on slate, shipbuilding, and railways. The town is still home to the world’s oldest-surviving railway company, the Ffestiniog Railway. Its steam locomotives puff up densely wooded mountain slopes, and past small patches of Celtic rainforest, before emerging into the slate-strewn, moon-like landscapes of the old mining centre, Blaenau Ffestiniog.