The Translation of Poetry

[RakoPatcher]

So I've recently read Beowulf. I hear a lot about the poetry of it. But I was wondering, how exactly does that work, since Beowulf has to be translated from Old English? And for works across the board, wouldn't the poetry of works be at least partly lost lost in translation between languages? Is the poetry of Beowulf in modern English really from the original, or is it a product of the translator?