Just when you think you've heard it all.... how 'bout this....???
Giant Concrete Arrows That Stretch Across America.
Ever so often, usually in the vast deserts of the American Southwest, a hiker or a backpacker will run across something puzzling: a large concrete arrow, as much as seventy feet in length, sitting in the middle of nowhere.
What are these giant arrows?
Some kind of surveying mark?
Landing beacons for flying saucers?
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