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Stockholm’s Abandoned Ordnance Datum

When walking across a little alley called Schering Rosenhanes gränd, you’ll find a large rock protruding from the wall with a small metal door inside of it. It may not look special, but don’t write it off just yet—it’s actually the Normalhöjdpunkten, Sweden’s official ordnance datum.

This datum was used as the main reference point for all other datums in Sweden and allowed surveyors to create accurate maps and sea level calculations. Inside the safe, there’s a small silver rod placed into a cut in the wall. This rod is located 11.8 meters above the average sea level, with a one-millimeter degree of accuracy.

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