City walls conquered the ancient world and then disappeared. Why?

Big Think ·
Wellness & Longevity United States

Ancient cities — the kind we know of more through archaeology than written history — tend to have a bunch of features that set them apart from smaller, less ambitious settlements. Most of these are still familiar, in some form, and not just in your friendly local metropolis. Look around any small town today, and you’ll spot the contemporary equivalents of monumental public buildings (town halls…

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