Herodotus set his story of the wars between Asia and Europe on the greatest of all possible stages, that of the entire earth. He understood, in a way that few Greeks of his day probably did, that the Persian empire was a national entity of unprecedented geographic scope and that the outcome of its wars against Greece had huge significance not just for human societies but for the earth as a whole. Thus his descriptions of distant lands, and even his biological and geographical inquiries, though often labelled 'digressions' by modern scholars and thus sidelined from the main narrative, are in fact very much a part of his artistic plan for his work. Persia was the first state in history that could plausibly assert the goal of making all lands one land, such that the sun would never shine on anything beyond its borders (7.8); indeed it succeeded, on two occasions, in uniting the continents of Europe and Asia by bridging the waters that stood between them - making all lands one in a geographic if not a political sense. This was world war in the truest sense: war threatening to change the world, including the world of nature.