Stock Photo - COPENHAGEN, DENMARK - AUGUST 22, 2014: Inside view of the spiral ramp of Round tower in Copenhagen, Denmark. The Round tower was built as an astronomical observatory in 1657. It is most noted for its 7.5-turn helical corridor leading to the top, and for the expansive views it affords over Copenhagen.

Stock Photo: COPENHAGEN, DENMARK - AUGUST 22, 2014: Inside view of the spiral ramp of Round tower in Copenhagen, Denmark. The Round tower was built as an astronomical.

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