William Grint takes a deep dive into the archives from the past five years and counts down his top five action-packed See Hear On Tour moments. He also takes on his own challenge as William attempts to reach the summit of Corn Du, a mountain that sits 2,864ft above sea level in the beautiful Brecon Beacons. But will he reach the top?As William begins his challenge, he looks back on so many incredible adventures both here in the UK and around the world, including Rosie Benn's visit to the Finnish forests of Kakskerta in Finland, ghyll scrambling in the Lake District and Nadeem Islam's trip to Penrhyn Quarry in North Wales.