Københavns Rådhus

Copenhagen's City Hall anchors Rådhuspladsen with its striking red brick facade and soaring 105-meter tower that's visible from across the city center. The 1905 National Romantic building houses the working city government, but you're here for two things: the tower views and Jens Olsen's World Clock, an intricate astronomical timepiece that tracks everything from planetary positions to a 25,000-year calendar. The building itself blends medieval Danish architecture with Italian Renaissance touches, creating something uniquely Copenhagen.

Inside feels surprisingly intimate for such a grand building. The Great Hall impresses with its vaulted ceilings and murals depicting Danish history, while the famous clock sits in a ground-floor alcove where you can watch its complex mechanisms tick through multiple dials. The tower climb involves 298 steps up narrow spiral staircases, but the panoramic views from the top span the entire city center. You'll spot the Round Tower, Nyhavn's colorful facades, and the copper spires of old churches spread below.

Most visitors rush through in 20 minutes and miss the building's working government atmosphere. Tower tours cost 40 DKK and run only at 11am and 2pm on weekdays (plus noon on Saturdays), so book ahead through their website. Skip the clock if you're short on time, the views are the real draw here. The morning tour offers clearer light for photos and smaller crowds than the afternoon slot.