When Christian IV built the tower, Denmark was quite famous for its astronomical achievements thanks to the astronomer Tycho Brahe.

When Brahe died in 1601, the King wished to continue Brahe's research and the Round Tower was built from 1637-1642. Of course, it is a while since the scientists left, but the observatory is still used by amateur astronomers and many visitors. The observatory is encircled by an outdoor platform from which you have a magnificent view of the old part of Copenhagen.

If you wish to get the amazing view on top, you need to walk up the spiral walk, which is 268,5 meters long at the outer wall and only 85,5 meters long close to the core of the building. This means that you walk around 209 meters to get to the top even though the tower is only 36 meters tall.

You will also experience the library hall, which once housed the entire book collection of the university. Denmark`s famous writer H.C. Andersen used to visit the library and he found inspiration for his work here. Today the hall serves as the framework for exhibitions of art, culture, history and science.

See also: Famous Copenhagen attractions