The Center of the Northwest Hemisphere

The precise intersection of 45° N and 90° W falls in a field in Wisconsin.
This is the point halfway between the North Pole and the Equator, and one quarter of the way around the world from the prime meridian in Greenwich.
The site is marked nearby with a sign . . .
with an official-looking survey marker at the base.
But the true center is actually a thousand feet away - a fact explained on a sign nearby.
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