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These Really Exist: Giant Concrete Arrows That Point Your Way Across America

Every so often, a hiker or a backpacker will run across something puzzling: a ginormous concrete arrow, as much as seventy feet in length, just sitting in the middle of scrub-covered America. What are these giant arrows? Jeopardy champ Ken Jennings solves the mystery.
Tsia • 1 year ago

Cement Arrows, Transcontinental Air Mail Route

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