Image by Visit Wales Image Centre

The world's oldest surviving narrow-gauge railway, the Ffestiniog wends its way from the slate-mining town of Blaenau Ffestiniog to Porthmadog. Long past its industrial heyday, its 150-year-old steam locomotives and monogrammed wooden carriages now ferry sightseers through oak woodlands, under towering peaks and beside flashing rivers. For an extra £7 each way, you can ride in giant-windowed observation carriages.

One child under 16 travels free with each ticket-buying adult; additional children travel half-price.