Edge Walking

Toronto’s CN Tower is a test for even the most extreme adrenaline junkies. But budding daredevils now face a new challenge, as the tower’s operators plan to let people walk hands-free around the outside of the 116-storey structure – held in place by only a cable. For $175 (£107), thrill-seekers can stroll around the top of the tower with no guard-rail and just a 5ft (1.5m) wide see-through ledge underneath.