in Scandinavian mythology, is the great hall or refectory of Gladsheim, the palace of the Æsir or Asgard. The Times, speaking of Westminster Abbey, says “The Abbey is our Valhalla.”
We both must pass from earth away, Valhalla's joys to see; And if I wander there to-day, To-morrow may fetch thee.
Frithiof-Saga, lay xi.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894