Will Self embarks on a 50 kilometre walking tour of the Large Hadron Collider at CERN just outside Geneva. Following the course of the Collider through the French and Swiss countryside, Will stops at regular intervals to descend to the tunnel and view the experiments below. He aims to complete the circuit entirely on foot. Invited to 'feel the wonder' of particle physics, Will is unconvinced. At lunch with his CERN hosts, he questions them closely on the rationale for their work. And as Will's journey gets under way, far from wondrous, he very soon finds himself wondering about his own capacity for misunderstanding - expressing concerns that his walking tour may be a complete waste of time. Producer: Laurence Grissell.