Rundetaarn, the Round Tower
A 17th-century observatory tower with a 209 m spiral ramp, built by Christian IV.
Rundetaarn, the Round Tower, was built by Christian IV between 1637 and 1642 as an astronomical observatory and church tower for the university. Instead of stairs, a spiral ramp winds 7.5 times around the core and rises 209 m to the platform, reportedly so that horse and carriage could reach the top. The observatory is still in use, and a viewing platform gives views across the medieval centre.
| Admission | Adult about DKK 40 (about USD 6) |
|---|---|
| Hours | Typically daily 10:00-20:00 in summer, shorter hours in winter |
| Address | Koebmagergade 52A, 1150 Copenhagen K |
Why it matters
Europe's oldest functioning observatory, built as part of Christian IV's scientific ambitions.
Site facts
- Built
- 1637-1642
- Architect
- Hans van Steenwinckel the Younger
- Style
- Dutch Renaissance
- UNESCO listing
- Not a UNESCO site
Location
Koebmagergade 52A, 1150 Copenhagen K
55.6813, 12.5755 View on map
Highlights
- Spiral ramp
- Observatory
- Rooftop view of the old town
Tips for visiting
- Entry is cheaper than most Copenhagen viewpoints
- Often hosts art exhibitions
When to visit
Late afternoon for views
Accessibility
The ramp is gently sloped and wheelchair users can reach most levels; confirm access before visiting.