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Urban Explainers

Over at Gizmodo, an urban designer who by chance discovered mysterious "wall-y" and "gate-y" landmarks on a map of London proceeds to flesh out a fascinating overview of how man-made fortifications shaped our cities. From perpendicular and star-shaped walls that kept people safe inside cities to the interstate highway system built to evacuate U.S. cities during an nuclear attack, the world's urban planning strategies have developed closely alongside evolving defense tactics. Read on, this way. [Gizmodo]