Rüdiger BenninghausStaircase of the Radziejowski or Copernicus Tower in the Frombork Cathedral Castle (Frauenburg / Warmian-Masurian Voivodeship, NE Poland), the former bell tower from the 14th-17th century.<br>
A Foucault's pendulum hangs in the center.<br>
(April 2015)<br>
(Foto: © Rüdiger Benninghaus)<br>
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