What was "Norse Paganism,"

Germanic paganism was a series of religious practices and beliefs that developed from the 5th century BCE onwards amongst Germanic peoples. 

A vital part of Germanic culture, it soon spread northward and developed into what scholars have called "Norse Paganism" or the "Old Norse religion" from the first few centuries CE. This northern branch saw a religion that was polytheistic with a belief in a pantheon of gods and goddesses.

Aside from these deities, a plethora of other magical entitles (from jötnar to dwarves) inhabit nine worlds (of which humans live on only one – Midgard) and several afterlife realms. 

Thanks, in part to the latest film adaption of the Marvel Thor comic books, Norse paganism has permeated into popular culture with Norse gods like Odin, Thor, and Loki (in their Hollywood form) commonly known.

Daily religious life involved a variety of ritual sacrifices (blót), both public and private. Remnants of huge pagan temples – often mentioned in the sagas – have been uncovered in Iceland, Norway, and Sweden. 

The most magnificent temple of Norse paganism, if we are to believe later medieval authors Adam of Bremen and Snorri Sturluson, was found at Uppsala in Sweden. Some archaeological evidence of this has been uncovered over the past century.