Kastellet and Copenhagen Ramparts Walk

The Kastellet and Copenhagen Ramparts Walk is a circular urban stroll of about 4 km in central Copenhagen, Denmark, starting at Kastellet, Kastelsvej 1, 2100 København Ø. Kastellet is a well-preserved star-shaped fortress with grassy ramparts, a moat and historic buildings. The nearest stop is Østerport Station on metro lines M3 and M4, about 5 minutes on foot, or visitors can walk about 15 minutes from Nyhavn. The walk itself is free, with no permit needed, and the fortress grounds are open day and night. Difficulty is easy: the terrain is flat except for the ramparts, which rise about 5 to 8 m, and the surface is paved or compacted gravel, with grass on the ramparts. Shade is limited, so the walk is exposed to sun and wind off the harbour. Walkers can circle the top of the ramparts, which offer views over the moat and the fortress interior, then leave through a gate toward Langelinie. Key landmarks are the fortress ramparts and moat, the windmill and old barracks inside the grounds, and the Little Mermaid statue on the Langelinie promenade beside the harbour. After the statue, the route returns along the harbour toward Østerport. The loop is short enough that no formal turn-around is needed, and any point can be left for the station. There are no refuge huts, but water, cafes and toilets are found near Østerport and along Langelinie. Allow about 1 hour 30 minutes with photo stops, and more if visiting the nearby museums.