A living landmark
of Copenhagen
since 1642

Restoration

In 2026, the dome and telescope will be carefully restored to preserve this unique cultural heritage.

LIGHTYEAR 2026

From February and all through 2026, you can enjoy special exhibitions, concerts and family-friendly events – all celebrating the 350th anniversary of Ole Rømer’s discovery of the speed of light.

What's on

Crystalline Memories of Deep Time

Exhibition

The Library Hall

14. Nov - 04. Jan
Ad Lucem

Exhibition

The Library Hall

06. Feb - 06. Apr
While the Light Hesitates

Light Installation, Winter Break

The Viewing Platform

06. Feb - 06. Apr
Create Stunning Blue Images with Cyanotype

For children, Winter Break

The Reading Room

07. Feb
Workshop: Paint with Light

For children, Winter Break

The Library Hall

09. Feb - 10. Feb
Lantern Walk for Children

For children, Winter Break

The Round Tower

12. Feb
Toward the Light – Classical Concert with Michalak and Schermi

Concert

The Library Hall

26. Feb
Winter Light Bar

Special event

The Viewing Platform

28. Feb

Listen to the Tower

Did a car really drive up the Round Tower’s Spiral Ramp? How often did famous fairy tale writer Hans Christian Andersen visit the tower? Immerse yourself in our audio stories, and find out.

The Library Hall

Hans Christian Andersen and the Round Tower

Arriving in Copenhagen as a young man, Hans Christian Andersen visited the Round Tower as one of the first things and was allowed to use the books in the University Library – provided that he put the books properly away after use. Later he returned to the tower numerous times in his writings.

The Spiral Ramp

The Hollow Core

The 12-year-old choir boy August Nielsen fell down 25 metres when he was playing hide-and-seek one Sunday in 1880 and strayed into the hollow core in the middle of the tower. Today, one can safely step onto the glass floor in the open recess and look down into the depths that used to constitute Denmark’s zero point.

A Virtual Tour of the Tower

Visit the tower from home with our virtual tour. Here, you can move up the Spiral Ramp, visit Trinitatis Church, scope out the current exhibition in the Library Hall and marvel at the 360 degree view of Copenhagen’s rooftops.