Round Tower, Copenhagen

Photograph by Robert Floerke

The Round Tower is a 17th-century tower built under the authority of Christian IV in central Copenhagen, Denmark . It was built as an astronomical observatory, and this image shows its well known, 7.5-degree helical corridor, which leads to the top and an expansive view of Copenhagen.

(This photo and caption were submitted to the 2011 National Geographic Traveler Photo Contest .)

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