The Round Tower

The Round Tower (Rundetårn) is a 17th-century observatory built by King Christian IV, known for its unique spiral ramp and panoramic views over Copenhagen’s old town. Part of the historic Trinitatis Complex, it once combined church, library, and astronomical research. Today, visitors walk the wide helical corridor to the viewing platform, explore small exhibitions, and peek into the former observatory. It’s an easy, central stop offering architecture, history, and city vistas without stairs. Best for travelers interested in Renaissance engineering, urban views, and a manageable cultural experience that fits well into a short itinerary.