Norse Mythology

Norse, Viking or Scandinavian mythology comprises the indigenous pre-Christian religion, beliefs and legends of the Scandinavian peoples, including those who settled on Iceland, where most of the written sources for Norse mythology were assembled. Norse mythology is the best-preserved version of the older common Germanic paganism, which also includes the closely related Anglo-Saxon mythology. Germanic mythology, in its turn, developed from an earlier Indo-European mythology.

Norse mythology is a collection of beliefs and stories shared by Northern Germanic tribes. It had no one set of doctrinal beliefs. The mythology was orally transmitted in the form of poetry and our knowledge about it is mainly based on the Eddas and other medieval texts written down during and after Christianization.

The Norse Mythology is quite the most complicated and largest mythology of all with the different kind of gods, the Edda, places etc. Too much to write it at this website :/

source & more infos:
Wikipedia
World Myth