An ancient astronomical observatory suitable for those who don't suffer from vertigo.
A good place to view the city from the sky.
The Rundetårn, or Round Tower, was built in the 17th century with the three-fold goal of training Danish scholars and academics in astronomy, the sciences and theology, by order of King Christian IV. Inside, there is an ancient Astronomical Observatory, the oldest still in operation in Europe, a chapel for the students and a library, which in former times hosted the largest university collection, and today serves as a cultural centre with temporary exhibitions and concerts. The Round Tower, at almost 35 metres above the ground, has a viewing platform from which you can enjoy the best views of Copenhagen's Latin quarter. To do this, you will have to conquer the seven and a half turns of the helical ramp/corridor that ascends through the inside of the tower to the top.