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The Round Tower (Rundetaarn), Copenhagen

A 17th‑century spiral ramp to the stars, the Round Tower blends royal history, sky‑gazing science and sweeping Copenhagen views in one compact city landmark.

4.5

Rising above the old Latin Quarter, Copenhagen’s Round Tower (Rundetaarn) is a 17th‑century observatory, viewpoint and cultural venue in one. Built by King Christian IV in 1642, it is famed for its wide, whitewashed spiral ramp that winds gently to a rooftop platform with sweeping city views. Along the way you pass the former university Library Hall, now a bright gallery for changing exhibitions and concerts, and can peek into the historic observatory that still studies the Danish night sky.

A brief summary to The Round Tower

  • Købmagergade 52A, Copenhagen, Indre By, 1150, DK
  • +4533730373
  • Visit website
  • Duration: 1 to 2 hours
  • Budget
  • Environment icon Mixed
  • Mobile reception: 5 out of 5
  • Monday 10 am-8 pm
  • Tuesday 10 am-8 pm
  • Wednesday 10 am-8 pm
  • Thursday 10 am-8 pm
  • Friday 10 am-8 pm
  • Saturday 10 am-8 pm
  • Sunday 10 am-8 pm

Local tips

  • Arrive close to opening time or later in the evening to enjoy the spiral ramp and viewing platform with fewer crowds, especially in high season and on clear days.
  • Wear comfortable shoes; the 200‑metre spiral ramp and final staircases are gentle but continuous, and the brick surface can feel uneven underfoot.
  • Check current information about observatory restoration and opening hours before you go if stargazing or access to the very top is important to your visit.
  • Pause in the Library Hall halfway up to explore the latest exhibition or simply rest by the tall windows and take in the building’s former life as a university library.
  • On windy or cold days, bring an extra layer; the viewing platform is exposed, and temperatures feel cooler at the top than on the street below.
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Getting There

  • Metro and short walk from central Copenhagen

    From Nørreport Station, one of Copenhagen’s main metro and S‑train hubs, it typically takes 5–8 minutes on foot to reach the Round Tower along level, paved pedestrian streets. All metro lines serving Nørreport run frequently throughout the day, and a single journey within the city centre costs around 20–25 DKK using standard public transport tickets or a travel card. The route is step‑free and suitable for strollers; only the interior of the tower presents accessibility challenges due to the ramp and stairs.

  • City bus to the Latin Quarter

    Several central bus routes stop around Nørreport and the adjacent streets, from where you can walk 5–10 minutes to the Round Tower through the old town. Bus journeys within central zones generally cost 20–25 DKK with a ticket or travel card, and services run every few minutes in daytime, slightly less often in the evening. Buses are low‑floor and accessible, though the tower itself has no elevator to the viewing platform.

  • Cycling through the city centre

    Copenhagen’s extensive cycling lanes make it easy to reach the Round Tower by bike in about 10–15 minutes from many central districts such as Vesterbro, Nørrebro or Østerbro. Expect to rent a city bike or standard bicycle for roughly 100–150 DKK per day from numerous rental outlets. You will need to dismount and walk your bike in the pedestrian section of Købmagergade, where cycling is restricted during busy hours.

  • Taxi or rideshare within Copenhagen

    A taxi ride from major inner‑city areas like the Central Station or Nyhavn usually takes 5–15 minutes depending on traffic. Typical fares range from about 80–150 DKK for short central journeys, with surcharges in late evening or on weekends. Vehicles drop passengers on nearby streets, from where there is a brief walk through the partly pedestrianised centre to the Round Tower’s entrance.

The Round Tower location weather suitability

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Discover more about The Round Tower

A royal tower at the heart of old Copenhagen

Completed in 1642 for King Christian IV, the Round Tower was conceived as a monument to learning, combining an astronomical observatory, a university library and a church within one ambitious complex. Rising above the narrow streets of the Latin Quarter, its brick cylinder quickly became a landmark on Copenhagen’s skyline, a role it has kept for nearly four centuries. The tower was the first part of the Trinitatis complex, designed so scholars could move from worship to books and on to the stars without leaving the building. Its position just off bustling Købmagergade still reflects that blend of everyday city life and lofty scientific purpose. From street level, the simple cylindrical form topped by a copper‑clad dome hints at the precision and curiosity that shaped it.

The famous spiral ramp and quiet alcoves

Instead of stairs, most of the ascent is via a broad spiral ramp that coils 7½ times around the hollow core. Originally wide and sturdy enough for horse‑drawn carts to carry heavy instruments and books, today it allows a gentle climb where people naturally fan out, pausing in shallow niches to catch their breath or look out of tall windows onto the rooftops below. The ramp’s whitewashed walls, worn brick floor and shifting daylight create a calm, almost meditative atmosphere despite the steady flow of visitors. Sound softens against the plaster, and each turn offers slightly different perspectives on the tower’s interior void. It is a rare example of early modern engineering that still feels surprisingly contemporary in its simplicity and accessibility.

The Library Hall: from books to culture

Roughly halfway up, the spiral opens into the Library Hall, once home to the entire book collection of the University of Copenhagen. Wooden floors, arched windows and exposed beams recall its scholarly past, when thousands of volumes lined the walls above the church below. Today the hall is a versatile cultural space hosting changing exhibitions, concerts, talks and seasonal events. Installations, photography, historical displays or design shows might occupy the room on any given visit. A small shop and café corner add to the sense of the tower as a living venue rather than a static monument, yet the proportions and patina of the hall keep its academic spirit intact.

Observatory dome and views across the city

Near the top, the route shifts from the ramp to a broad wooden staircase and a tighter stone stair that lead to the viewing platform and observatory. The open-air deck offers a 360‑degree panorama of Copenhagen: copper spires, church towers, the tiled roofs of the old town and, on clear days, a glimpse of the Øresund and Sweden beyond. Orientation tables help you pick out landmarks such as Rosenborg Castle and the Marble Church. Above the platform sits the historic observatory, one of the oldest functioning facilities of its kind in Europe. It has long served astronomers and enthusiasts, with telescopes used for public stargazing evenings in the darker months. Ongoing restoration work on the dome and interior aims to protect this scientific heritage while keeping the observatory active for future generations.

Experiences, seasons and ongoing restoration

The Round Tower is open most of the year, with longer evening hours in the lighter months and special night openings in winter for astronomy activities. Entry includes access to the ramp, Library Hall exhibitions when they are not being installed, and the viewing platform when weather and works allow. Temporary closures of the very top can occur during maintenance or the current refurbishment of the observatory dome. Despite its central location on a busy shopping street, the tower retains an intimate character inside. The slow spiral ascent, the changing cultural programme in the Library Hall and the chance to step into a working observatory make it more than just a viewpoint. It is a compact journey through Danish history, architecture and science, wrapped into a single, elegantly rounded structure in the heart of the city.

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