According to Norse myth, Valhalla has 540 doors.
The number appears in Grímnismál, a poem of the Poetic Edda in which Odin, disguised as Grímnir, describes the halls and geography of the divine world. The poem says that Valhalla has “five hundred doors and forty more,” giving the total of 540. It also says that 800 warriors can pass through each door when the slain warriors march out to fight the wolf at Ragnarök.
Valhalla is Odin’s great hall in Asgard. Valkyries bring many warriors who die in battle there, and these chosen dead, called the einherjar, feast and fight until the final battle. The hall is described with shields for a roof, spears for rafters, and armor spread across its benches.
The 540 doors are sometimes confused with the 800 warriors associated with each door. Multiplying the poem’s figures gives 432,000 warriors, though the passage is poetic rather than an architectural census. Valhalla is also not the only destination for the battle-dead: Freyja is said to receive half of those slain in her field, Fólkvangr.