The Round Tower, or Rundetaarn, is a 17th-century observatory on Købmagergade in central Copenhagen. Its broad spiral ramp leads past exhibition spaces and historic rooms to an open viewing platform, where you can look across the city’s rooftops and church spires. The tower was built under King Christian IV as part of a complex that also included a church and library. The gradual ascent is unusual for a tower, though a short staircase leads to the roof, so the final section is not step-free.
An observatory built by Christian IV
The Round Tower was built between 1637 and 1642 under King Christian IV. It formed part of the Trinitatis Complex, which brought together an observatory, a university library and a church. The project followed Denmark’s strong interest in astronomy and was intended to continue the work associated with astronomer Tycho Brahe.
The tower’s observatory is still in use. Today, the building also functions as a public lookout and exhibition space, connecting its scientific history with a visit to central Copenhagen.
The ramp and the rooms along the way
The tower’s main route upward is a broad spiral ramp rather than a conventional staircase. Its design allowed horses to carry people and supplies toward the observatory. Walking the ramp is part of the visit: the route passes historic spaces and exhibition areas, with alcoves offering different glimpses of the city.
Exhibitions inside the tower cover astronomy and other scientific or artistic subjects. Displays can change, so the specific material on view depends on the visit. Take time to look around rather than treating the ascent as a direct route to the roof.
Views from the rooftop
At the top, the viewing platform looks out across Copenhagen’s rooftops, church spires and older buildings. On a clear day, views can extend as far as Sweden. The platform is outdoors, and protective barriers line the edge.
A short set of stairs leads to the final rooftop section. The ramp makes most of the climb gradual, but this last part means the route is not fully accessible to wheelchair users or strollers. Advance tickets are recommended, and visiting before midday can help avoid busier periods on the walkway.
Preguntas frecuentes
Where is the Round Tower in Copenhagen?
It is at Købmagergade 52A in central Copenhagen.
How long does a visit to the Round Tower take?
Allow about 30 to 60 minutes to walk the ramp, explore the exhibition spaces and see the city from the roof.
Is the Round Tower accessible by wheelchair?
Access is limited on some sections. The final part of the route to the roof uses a narrow staircase.
What can you see from the top of the Round Tower?
The rooftop platform looks across Copenhagen’s rooftops and church spires. On a clear day, the view can reach Sweden.
