Þrúðheimr and Bilskirnir

Thor’s house is the largest of all. Grímnismál says he will dwell in Þrúðheimr until the powers perish, and that of all the roofed houses the speaker knows, Bilskirnir is the greatest, with five hundred and forty floors. The name Þrúðheimr means “home of strength”. The entry also notes that the sources disagree on what to call Thor’s dwelling, and that copyists sometimes mixed it up with a giant’s home of a similar name.