The Round Tower

Ascending the Rundetaarn (Round Tower) is less of a climb and more of a rhythmic sensory experience, as you wind your way up a unique 209-meter-long spiral ramp that once allowed horse-drawn carriages to reach the library at the summit.

What to expect — what visitors actually see/do

The journey begins through a heavy stone archway leading to the hollow, whitewashed core of the tower. Instead of stairs, you traverse a gradual, spiral cobblestone slope. Halfway up, you can step into the Library Hall, a cavernous, beautifully lit space that hosts rotating art exhibitions and concerts.

Upon reaching the top, you emerge onto an open-air platform encircled by a wrought-iron railing. From this vantage point, the chaotic, delightful tapestry of Copenhagen’s historic center unfolds beneath you: the jagged copper spires of the city, the sea of red-tiled gabled roofs, and, on clear days, the distant silhouette of the Øresund Bridge connecting Denmark to Sweden. Inside the tower’s white dome, you can still view the functioning astronomical observatory, which remains the oldest of its kind in Europe.

History & significance — brief background

Commissioned by King Christian IV and completed in 1642, the Rundetaarn was designed as part of the Trinitatis Complex, which included a university library and a church. The tower served as a pillar of Danish astronomy; world-renowned astronomer Ole Rømer once used it to calculate the speed of light. Its construction is a marvel of 17th-century engineering, specifically designed with a ramp so that the king could ride a horse all the way to the top to avoid walking.

Practical tips — opening hours, tickets, queues, best time of day

Tickets: You can purchase tickets at the entrance kiosk or via their website.
Timing: The tower is generally open daily, usually from 10:00 to 18:00 (with extended evening hours on select days).
Avoiding Crowds: Visit right at 10:00 AM on a weekday to avoid the school groups and mid-afternoon tourist surges.
Accessibility: While the ramp is easier than stairs, it is quite steep in sections; sturdy footwear is recommended.

Getting there — neighbourhood, transport

The Round Tower is located in the heart of the Indre By (Old Town) district on the street Købmagergade, a bustling pedestrianized shopping artery. It is a 5-minute walk from the Nørreport Station, which serves as the city’s main transit hub for S-trains, Metro lines (M1, M2), and regional rail.

Nearby — 2-3 sights or eats within walk distance