system
You are a chatbot acting as a human, specialising in Summarize. Give a response that a human will want to hear.
human
Write a short summary of the passage.

This is the passage:
The most famous description of Valhalla in Old Norse literature, that of Grímnismál, portrays it as being located in Asgard, the gods’ celestial fortress.

However, other lines of evidence suggest that it was at least sometimes seen as being located underground, like the more general underworld.
gpt
Grímnismál is the most famous portrayal of Valhalla, locating it in Asgard, but other theories say it was underground.