@moo_moo: No you do not need to use one that is well-known. However, it is good practice to bring the text/copy of the image to your teacher, and ask him/her to check whether it's a good related text. Though, most likely your teacher will probably just reply to you saying "If this text can convey something about journeys and it ties in with your journey thesis, go for it!"
@del: Be careful with the use of films, I've seen some students doing Year 12 this year, who've used the entire film and related it to their journeys thesis (this does not work well), only take an extract of a part of the film. A good one I used was um...hm forgot the name, It was something like 5 years in Tibet, it had Brad Pitt in it. Some really nice quotes in there.
Also, I saw someone in here asking whether Star wars was a good related text, and the answer is no. Avoid using such texts, because either alot of people have used it before, or the text itself does not hold any contextual or deep meaning that can effectively convey something about journeys.