Rundetaarn (Round Tower) Tickets

There are no stairs for most of the way up. Instead a wide, gently rising cobbled ramp spirals seven and a half times around a hollow core, so smooth that a Russian tsar once rode a horse to the top and, the story goes, his tsarina followed in a carriage. Rundetaarn, the Round Tower, has stood on Kobmagergade since 1642, and climbing it is still one of the most quietly memorable half-hours in central Copenhagen.

What is the Round Tower and what will you see?

Rundetaarn is a 17th-century tower built by King Christian IV as an astronomical observatory, finished in 1642. Its signature is the spiral ramp you walk up instead of stairs, about 209 metres of rising cobbled corridor. Along the way and at the top you find the old Library Hall exhibition space, a glass floor suspended over the tower's core, and an open platform with one of the best rooftop views over the old town.

The tower is the round part of a larger complex. Christian IV built it against the Trinitatis Church, with a university library once housed in the great hall above the nave, all tied together as a centre for learning in the new district he was laying out. The observatory at the summit is the oldest functioning one of its kind in Europe, and astronomers still use it, which is a rare thing for a building this old and this central.

The Library Hall, reached partway up the ramp, now hosts changing art and history exhibitions and concerts, so what you see there depends on the season. Higher up, a glass platform lets you look straight down the hollow core of the tower, a small vertigo test that children tend to love. One honest note for 2026: the observatory dome and telescope are under restoration during the year, so the star-gazing element may be limited; the ramp, the hall and the rooftop view are unaffected.

The reward at the top is the view. From the open walkway you look across the copper roofs and spires of medieval Copenhagen, out toward the harbour and the newer towers beyond. It is not the tallest viewpoint in the city, but it is the most characterful, framed by the tower's own low stone wall and reached by that famous ramp rather than a lift.

The ramp has its own legends. It was built wide and shallow so a horse and cart could haul heavy books and instruments up to the library and the observatory, and that same gradient is why Tsar Peter the Great is said to have ridden to the top in 1716. Whether or not every detail of the story holds, the design is real enough: seven and a half turns of cobbled floor that carry you up almost without your noticing the climb.

How do Round Tower tickets work?

Rundetaarn sells tickets at the door only. There is no online booking anywhere, and nothing to reserve ahead, so you simply turn up, pay and climb. An adult ticket is about 60 DKK, and children under 17 go free. Because it is a walk-up sight with a small entry price, there is no time slot to plan around and no queue-skip ticket to buy.

This is unusual among Copenhagen's paid sights, and worth stating plainly: if a website offers to sell you a Round Tower ticket in advance, you do not need it. The tower runs its own ticket desk at the base and that is the only way in. The low price and the door-only system are part of why it stays an easy, spontaneous stop rather than something you schedule.

For current prices, any concession rates and the live opening calendar, the official site is the place to check. There is no hard sell here and no advantage to booking through anyone: walk to Kobmagergade, buy at the desk, and start up the ramp. You can find the visitor details on rundetaarn.dk.

The door-only system has one quiet upside on a packed day. Because nobody can pre-book, the line moves at the pace of the ticket desk rather than a stack of timed reservations, and it rarely amounts to more than a few minutes. Bring a card or cash for the desk and you are climbing within moments of arriving, which suits the tower's role as a spur-of-the-moment stop.

How long do you need at the Round Tower?

Most people spend 30 to 60 minutes at Rundetaarn. The climb up the ramp takes about ten to fifteen unhurried minutes, and you will want time at the top for the view and photos. Add more if there is an exhibition on in the Library Hall or if you stop at the glass floor over the core on the way up.

The ramp is what makes the visit. It rises so gently that pushchairs and less mobile visitors can manage most of the way, and there is only a short final spiral staircase near the very top to reach the open platform. Because you are walking a corridor rather than counting steps, the climb feels far shorter than the height suggests, and there are landings and windows to pause at along the way.

If the Library Hall has a show or a concert, budget an extra half-hour; it is a beautiful long room and worth a look regardless of the exhibition. Families often make the glass floor and the view the highlight, then head straight back down. As a single sight it fits neatly into a wider walk through the old town rather than filling a morning on its own.

Know before you go: hours, closed days and getting there

Rundetaarn stands at Kobmagergade 52A in the old town, a five-minute walk from Norreport station. In summer, from 1 April to 30 September, it generally opens daily 10:00 to 20:00; in winter it opens daily 10:00 to 18:00. Unlike many Copenhagen museums, it stays open on Mondays. Check the exact date on the official site, since hours shift around holidays and events in the Library Hall.

Getting there is simple. Norreport, the city's busiest interchange, is served by the Metro, the S-train and regional trains, and the tower is a short, flat walk down the pedestrian shopping street Kobmagergade from there. Kongens Nytorv on the Metro is a similar distance from the other side. There is no car parking to speak of in this pedestrian zone, so arrive on foot or by train.

A few practical notes before you climb. The ramp is broad and even, which makes the tower far more accessible than most historic climbs, though the final short staircase to the platform is not step-free. There is no lift. Weather shapes the visit too: the rooftop platform is open to the sky, so a clear evening in the long summer hours gives the best light over the copper roofs, while a wet day still works because most of the climb and the Library Hall stay under cover. If you are chasing the view, aim for the last hour or two before closing in summer, when the low sun catches the spires. The at-a-glance table below sums up the essentials, and the live times sit on the official site.

What can you pair with the Round Tower nearby?

The Round Tower sits in the heart of the old town, so several of the city's headline sights are a short walk away. Rosenborg Castle and its crown jewels are about ten minutes north through the King's Garden, the National Museum of Denmark is a little to the south, and Christiansborg Palace on Slotsholmen is a straightforward walk in the same direction. All three are covered by the Copenhagen Card.

For the natural next stop, walk up through the greenery to Rosenborg Castle, where the Danish crown jewels sit in the basement treasury and the King's Garden gives you a park to rest in afterwards. If you would rather go deeper into the country's history, the National Museum of Denmark runs from the Vikings to the present a few streets the other way.

Palace fans can carry on to Christiansborg Palace for the Royal Reception Rooms, the medieval ruins beneath the courtyard and its own tower view. A Copenhagen Card bundles all three of those with the trains and Metro, which makes an old-town day easy to price around a spontaneous Round Tower climb; you can see what the pass includes on the Copenhagen Card site, and there is background on the tower itself on Wikipedia.

Questions people ask