within it? What purpose did it serve? And can this incredible structure really be seen from space? A Noiser production, written by Fiona Veitch-Smith. With thanks to William Lindesay, a geographer, explorer, conservationist, and leading expert on the Great Wall of China. For ad-free listening, exclusive content, and early access to new episodes across the Noiser network, join Noiser+. Now available for Apple and Android users. Click the Noiser+ banner on Apple or go to noiser.com/subscriptions to get started with a free trial. Learn more about your ad choices. Visit podcastchoices.com/adchoices20:T63f,

While Alexander the Great's successors were fighting over control of his empire, Celtic-speaking migrants were moving east along the Danube River, mostly unseen and unnoticed by the Greeks to their south. The Macedonian kings should've been paying more attention, because soon, those Celts would launch one of the largest invasions of Greece in recorded history.

Patrick's book is now available! Get The Verge: Reformation, Renaissance, and Forty Years that Shook the World in hardcopy, ebook, or audiobook (read by Patrick) here: https://bit.ly/PWverge. And check out Patrick's new podcast The Pursuit of Dadliness! It’s all about “Dad Culture,” and Patrick will interview some fascinating guests about everything from tall wooden ships to smoked meats to comfortable sneakers to history, sports, culture, and politics. https://bit.ly/PWtPoD

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