The Round Tower in Copenhagen Denmark
The Rundetaarn or Rundetårn (Round Tower) is a 17th-century tower located in central Copenhagen, Denmark, and one of the many architectural projects of Christian IV of Denmark, built as an astronomical observatory. It is most noted for its equestrian staircase, a 7.5-turn helical corridor leading to the platform at the top at 34.8 meters above ground, and for the expansive views which it affords over Copenhagen.
