The Rundetårn (English: Round Tower) is a 17th-century tower located in central Copenhagen, Denmark. One of the many architectural projects of Christian IV, it was built as an astronomical observatory. It is most noted for its 7.5-turn helical corridor leading to the top, and for the expansive views it affords over Copenhagen.

The tower is part of the Trinitatis Complex which also provided the scholars of the time with a university chapel, the Trinitatis Church, and an academic library which was the first purpose-built facilities of the Copenhagen University Library which had been founded in 1482.

Today the Round Tower serves as an observation tower for expansive views of Copenhagen, a public astronomical observatory and a historical monument. In the same time the Library Hall, located above the church and only accessible along the tower’s ramp, is an active cultural venue with both exhibitions and a busy concert schedule.

Instead of stairs, a 7.5-turn spiral ramp forms the only access way to the towertop observatory as well as the Library Hall and the Bell-Ringer’s Loft, both located above the church. The ramp turns 7.5 times around the hollow masonry core of the tower before reaching the observation deck and observatory at the top, on the way also affording access to the Library Hall as well as the Ringer’s Loft. This design was chosen to allow a horse and carriage to reach the library, moving books in and out of the library as well as transporting heavy and sensitive instruments to the observatory.

The winding corridor has a length of 210 m, climbing 3.74 m per turn. Along the outer wall the corridor has a length of 257.5 m and a grade of 10%, while along the wall of the inner core the corridor is only 85.5 m long but has a grade of 33%.


architecture, copepnhagen, denmark, the round tower, rundet rn, christian iv, 17th century, astronomical observatory, kira bodensted

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  • Shulie1
    Shulie16 months ago

    Fabulous image!

  • Thank you Shulie ?

    – © Kira Bodensted

  • Bunny Clarke
    Bunny Clarke6 months ago

    How beautiful this is. I love the lines and textures in this.

  • Thank you very much Bunny ?

    – © Kira Bodensted

  • Christina Brundage
    Christina Brun...6 months ago

    Fantastic photo and love the writeup, Kira! I’d love to see that in person.

  • Thank you very much Christina, it’s very unique ?

    – © Kira Bodensted

  • hanspeters
    hanspeters6 months ago

    It is a beautiful , well composed picture.

  • Thank you very much for the compliment ?

    – © Kira Bodensted

  • Sherri     Nicholas
    Sherri Nic...6 months ago

    I just love this Kira, so beautiful , and I just read the history behind it..thank you for that, the picture now means more. I always love to read if someone has history when I happen to think something is lovely and then I find out more about it.. it is so so beautiful the architechure …heck sometimes I can spell it and sometimes was not the day.hehe
    happy day

  • Don’t worry about the spelling Sherri, it’s the thought that counts and you are always so kind.
    Thank you for that. I’m glad you enjoyed the story too. Have a lovely Sunday ?

    – © Kira Bodensted

  • Sherri     Nicholas
    Sherri Nic...6 months ago

    thank you so much for your nice hav e a great Sunday to

  • ?

    – © Kira Bodensted

  • CrismanArt
    CrismanArt6 months ago

    Love the amazing architecture, Kira! The way the light is placed to bring out the textures and highlights with shadows of the round walls! *

  • Thank you very much Christiane – so glad you enjoy it. ?

    – © Kira Bodensted

  • Lucinda Walter
    Lucinda Walter6 months ago

    Fabulous capture! Love those beautiful lines

  • Thank you very much Lucinda – it is a very unique place ?

    – © Kira Bodensted

  • Keith Reesor
    Keith Reesor6 months ago

    Amazing capture Kira!! :)

  • Thank you Keith ?

    – © Kira Bodensted

  • andy551
    andy5516 months ago

    very very very fascinating image !

  • Thanks Andy – it’s a fascinating place ?

    – © Kira Bodensted

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