The story
Take a moment to look around you. You are standing at one of the busiest, most frantic intersections in Copenhagen. To your left and right, the metal stream of H.
C. Andersens Boulevard and Nørre Voldgade roars with the sound of commuters and cyclists. It is a place defined by the 21st century.
But right here, sunken slightly into the earth and surrounded by a quiet island of stone and grass, is a stubborn fragment of a much older world. This circular red-brick ruin is all that remains of Jarmers Tower. It looks like a hollow tooth pulled from the jaw of history.
To understand why it sits here, isolated amidst the traffic, we have to look back to a time when Copenhagen was a fortress, encased in a ring of massive walls and deep moats. The story of this spot actually begins in the year 1259. At that time, Denmark was tearing itself apart in a civil war between the crown and the church.
An opportunistic Wendish prince from the island of Rügen, named Jaromar II, saw his opening. He wasn’t a friend of the Danish King, and he arrived with a fleet and a thirst for conquest. It was precisely at this point in the city’s defenses that Jaromar and his men managed to breach the ramparts.
They didn't just climb the wall; they smashed through it. The ensuing slaughter was legendary, and for centuries after, this section of the fortifications carried his name—Jarmer—as a grim reminder of the day the city fell. The ruins you see today aren’t actually from Jaromar’s time, however.
They belong to a much later tower, built around 1528 during the reign of Frederick I. This was one of the last major upgrades to the medieval wall before the age of gunpowder changed everything. If you look closely at the masonry, you can see the craftsmanship of the late Middle Ages—thick, sturdy brickwork designed to withstand siege engines.
By the mid-1800s, Copenhagen was suffocating behind its ancient walls. The city was filthy and overcrowded, and the decision was finally made to tear the fortifications down and let the city breathe. Most of the walls were leveled to create the "green belt" of parks you see nearby, like Ørstedsparken.
But this small stub of Jarmers Tower was spared, left behind as a lonely sentinel. Today, it serves as a bridge between two worlds. Above you, the modern office buildings and the rush of the capital signify Copenhagen's future.
But down here, in the shadow of the red brick, you are standing on the very spot where a prince once broke a city. It is a quiet reminder that beneath every modern street lies the blood and stone of a forgotten battlefield.