Kastellet is a 17th-century citadel near Copenhagen’s waterfront, still used by the military and open to the public. Its pentagonal layout, encircled by a moat and raised grassy paths, makes for a rewarding walk with views across the canals and harbor. Follow the ramparts, then explore the red and yellow buildings inside the fortress. Look out for the historic cannons and the windmill, built in 1847. Kastellet is also an easy stop on the way to the Little Mermaid statue.
A fortress shaped around its defenses
Kastellet was founded in the 17th century as part of Copenhagen’s defenses. Its five-sided plan has a bastion at each point, with a moat tracing the same outline. The raised earthworks and channels give the site its distinctive shape, especially when seen from above.
The paths along the ramparts take you around the edge of the complex. From there, you can look over the water and across the grounds, then descend to walk among the buildings inside. Old cannons remain on the mounds, reminders of the fortress’s military purpose.
Buildings, church and windmill
The interior contains historic buildings painted in red and yellow. Some are used as barracks or offices, so Kastellet is not simply a historic park. Military activity continues alongside public access, and you may see personnel moving through the grounds.
The windmill is one of the site’s most recognizable landmarks. Built in 1847, it is the only survivor of a group of windmills once placed on the bastions. Kastelskirken, the citadel’s church, is another historic building within the complex. The compact windows and weathered walls of the older buildings make a contrast with the open grass and water around them.
Walking the grounds
Kastellet works well as a quiet pause in a day of city sightseeing. Its paths are used by walkers and joggers, while the grassy ramparts provide a route around the fortress and views toward the canals. Allow time to explore both the outer circuit and the interior rather than treating the citadel as a quick pass-through.
The grounds are close to the Little Mermaid statue, so the two can be combined in one visit. Kastellet is open to the public, but it remains an active military area. Follow local restrictions, including the ban on cycling within the fortress, and give military personnel space as they go about their work.
FAQ
Is Kastellet free to visit?
Yes. The grounds are open to the public free of charge.
How long should I spend at Kastellet?
The material does not specify a typical visit length. Allow time to walk both the ramparts and the paths inside the fortress.
Can you visit Kastellet and the Little Mermaid together?
Yes. The Little Mermaid statue is close by, and Kastellet makes a convenient stop on the way.
Is Kastellet still a military site?
Yes. It remains in military use, although the grounds are open to the public.
