After the delightful wooden elevator down from Antwerp's streets, the 1876-foot pedestrian tunnel under the Scheldt is "staggeringly monotonous," reports Atlas Obscura, but I rather like it. I have one question: what would the diameter of a well-lit circular tunnel like this need to be for its curvature to be imperceptible?
Actually, I have another question: What would the diameter of a dimly-lit circular tunnel like this, lined with books, need to be for its curvature to be imperceptible?
Photo: Trougnouf (CC BY-SA 4.0)
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