Scholastic
Scholastic: Myths From Around the World: Norse Lands
Discover the battles of Fenrir, the great wolf, and Ragnarok, the twilight of the Gods.
Encyclopedia Mythica
Encyclopedia Mythica: Ragnarok
This site shares an encyclopedia entry for the a mythological topic of "Ragnarok".
Other
Rosala Viking Centre: Viking History
This Rosala Viking Centre website offers an excellent, but brief, history and mythology of the Vikings. The site includes photos, and images that can be clicked to enlarge them.