Highlights from Mid-Wales

Derek searches for his finest hikes after 17 years of walking around Wales.

The first walk he rediscovers is slap bang in the middle of Wales, in the foothills of the Cambrian mountains, where he walks around the Hafod estate - a 200-year-old tourist playground of spectacular woods, waterfalls and riverside trails.

Next, Derek recalls a stroll on the Welsh border in Presteigne, with a young man who walked the entire 1,100-mile perimeter of Wales to raise awareness and funds for Alzheimer's.

Finally, Derek travels to the Elan valley in Powys for a stunning seven-mile circular walk, punctuated by incredible feats of engineering - dams. He learns how the valley was flooded to supply water to Birmingham, he tries out downhill mountain biking and learns how the famous Dambusters’ bouncing bombs, key to the war effort, were tested here.