A Switchback is a challenge in which teams encounter a task from a previous season that was markedly difficult or memorable. The Switchback is associated with the same country or city as the original task, and often done at the same specific location. For example, the first Switchback in Season 15 recreated a hay-rolling Roadblock from Season Six's visit to Sweden; and a Switchback in Season 27 forced teams to free fall into the Batoka Gorge and swing above the Zambezi River, as was done in the first leg of "The Amazing Race 1". Other than making note of the noteworthiness of the challenge, the Switchback did not affect the game mechanics of the race.