Built at King Christian IV's orders in the 1630s, the Round Tower (Rundetårn) is Europe's oldest observatory. It has excellent views of Copenhagen V in which it sits, and is a popular spot for couples sharing tender moments.
Built by Christian IV, this impressive centre of astronomy forms part of a 17th-century scholastic complex that originally included a university library and a student church. A 209-metre spiral ramp leads to the top of the tower that gives it its name, where a platform offers a fantastic view over the old parts of the city. It also bears a beautiful wrought iron lattice made in 1643 by Kaspar Fincke, a well-known court artist.
It used to be that scholars alone could gaze at the sky, but now anyone can peek through the fine astronomical telescope of the tower in the winter period. The tower's excellent website tells you everything that you need to know - including details of all the exhibitions and live concerts being held here.