Rundetårn (Round Tower)

This distinctive red-brick tower has been Copenhagen's most recognizable silhouette since the 17th century, offering visitors a unique spiral ramp instead of stairs as they ascend 34.8 meters to panoramic city views. The tower was built by King Christian IV as an observatory and library, blending practical function with architectural flair that still captivates today. From the top, you'll see the city unfold in every direction, from Nyhavn's colorful facades to modern Copenhagen stretching toward the sea.