22 gwynedd fairbourne to barmouth

■Distance: 4½ miles/7.2km ■Time: 3 hours ■Grade: Moderate

Shaping both the land and the lives of those who built them, viaducts and aqueducts are monuments to ambition, sacrifice, and change

■Distance: 11½ miles/18.5km ■ Time: 6 hours ■ Grade: Challenging

DIFFICULTY EASY DISTANCE 14KM TIME 5 HOURS ...

DIFFICULTY MEDIUM DISTANCE 17.7KM TIME 5½ ...

BACK in the days when a tankful of petrol cost as much as we pay for a coffee today, our sunny Sunday afternoon treat was a drive out. If we weren’t aiming for the beach, our route took us north to th