There is a military secret across the river

est.reading time: 4 min

Hidden in plain sight

During our running tours, while crossing the Douro on one of its bridges, we’re usually too busy admiring the sunrise to the east. But southeast of our position, just a couple of hundred meters away, lies the Geophysical Observatory (Instituto Geofísico do Porto)—a site that once played a silent, high-stakes role in global geopolitics.

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