Scandinavian folklore (special focus on Norway)
Pictures:
Nøkken, Valemon, and Draugen by Theodor Kittelsen
Dragon, Huldra, Trolls, Elves, (first picture), by John Bauer
Fossegrimen by http://birgitte-gustavsen.deviantart.com/art/Fossegrimen-160045627
Kraken by Bob Eggleton