The first three videos above came from the channel History is Happening which contains some excellent videos for a wide range of topics in world history. The last video in the list came from All Histories which also has a great collection of more than 300 history videos.

The BBC offers a virtual tour of a World War I trench that some of my former students showed me a few years back because they enjoyed it. The BBC also has some short films about WWI. There are six films that show students artifacts and images of a British soldier's life during WWI. The films are sequenced beginning with recruitment continuing on to life in the trenches and ending with information about injuries and shell shock. The BBC also offers an animation of army movements from 1914 through 1918.