The Round Tower, Copenhagen Travel Guide

Standing at the very heart of Copenhagen’s Indre By, the Round Tower (Rundetårn) is one of the city's most recognizable and beloved landmarks. Completed in 1642 under the reign of King Christian IV, this cylindrical structure was conceived as part of the Trinitatis Complex—a blend of university church, library, and astronomical observatory. Its brick design and harmonious proportions set a classical tone, but it’s the 7.5-turn spiraling ramp inside that makes the tower truly unique; originally built wide enough for a horse and carriage to ascend, its gentle slope today enchants children and curious adults alike as they spiral upwards beneath vaulted ceilings.For centuries, the tower has been a center of scientific discovery. Scholars once gathered under the copper dome to study the stars—Hans Christian Ørsted himself observed here. While still housing Northern Europe’s oldest functioning observatory, the Round Tower is now as much a cultural hub as a scientific relic. The ascent takes you past exhibitions on Danish history and astronomy, culminating in a glass-floored platform that hovers above the hollow core, letting brave visitors peer 25 meters down.At the top, 360-degree views span the tiled rooftops and slender spires of Copenhagen, from regal palaces to the city’s surrounding parks and the distant waters of Øresund. The atmosphere is a blend of history and modern culture, with events ranging from contemporary art shows in the gallery to musical performances in the ancient library hall. The venue’s central location means it often buzzes with life, yet it retains a certain tranquil grandeur, especially in the early morning or as dusk falls over the city. Whether you’re gazing at stars, tracing the footfalls of scholars past, or simply enjoying a unique vantage point, the Round Tower is a cornerstone of the Copenhagen experience.