http://www.history.com/videos/causes-of-world-war-i#causes-of-world-war-
http://www.history.com/topics/world-war-i/videos#wwi-firsts
http://military.discovery.com/battles-history/videos/world-war-1-videos.htm
Similar Websites:
http://www.firstworldwar.com/
http://www.bbc.co.uk/history/worldwars/wwone/
http://www.pbs.org/greatwar/
http://www.1914-1918.net/soldiers/research.html
http://www.history.com/topics/world-war-i/videos#wwi-firsts
http://military.discovery.com/battles-history/videos/world-war-1-videos.htm
Similar Websites:
http://www.firstworldwar.com/
http://www.bbc.co.uk/history/worldwars/wwone/
http://www.pbs.org/greatwar/
http://www.1914-1918.net/soldiers/research.html