Colditz was also the subject of several movies and TV series, including (per Wikipedia):
The Colditz Story (1955):
The prisoners of Colditz are high-spirited and eager to needle the Germans. The escape officer of the British contingent, Patrick Reid (Mills), assists in the escape of other prisoners and finally carries out his own escape. The culmination of his escape, his successful crossing into Switzerland, is not depicted in the film.
Amazon.com lists a Region 2 DVD of the film (which may not work in North America).
Almost all of the events depicted in the series, except for dramatic points like the Kommandant's son and Colonel Preston's wife and mother, have a basis in truth. Most of the characters are loosely based on one or several actual persons. The most obvious are Pat Grant (Patrick Reid) and Hauptmann Ulmann (Reinhold Eggers).
TV: (2005) ... though the most interesting comment is on the main Oflag IV-C page:
This tale is much more fictional than its predecessors, with fictional characters and situations that are merely based on real people and events.
(The image isn't related to the movie or TV series; I just wanted to include a pre-restoration view.)