Cold War Museum Stevnsfort

From Secret Fortress to Story of the Cold War

Stevnsfort was built in the 1950s as part of Denmark’s frontline defence in the Cold War, positioned to monitor and, if necessary, block Soviet ships moving through the Baltic towards Copenhagen and the NATO heartland. Hidden beneath a flat coastal field by the dramatic cliffs of Stevns Klint, the fortress remained classified for decades, its existence known only to those who served here and a handful of officials. Today the site has been transformed into a museum, but much of the infrastructure remains exactly as it was during its operational life. Maps still line the walls of the operations rooms, equipment is left in place, and you can trace the fort’s role as a listening post, radar station and heavy artillery battery poised for a conflict that, fortunately, never erupted.

Life 18 Metres Underground

The heart of the museum lies 18 metres below ground in a honeycomb of tunnels and chambers carved out of resilient limestone. The underground complex stretches for roughly 1.6 to 1.8 kilometres, housing everything from communications centres and radar plotting rooms to dormitories, storerooms and technical workshops. The thick chalk and reinforced construction were designed to withstand blast pressure and protect the garrison from nuclear, biological and chemical weapons. Guided tours lead you through these passageways, where constant cool temperatures and a slightly damp atmosphere add to the sense of stepping back in time. You pass heavy blast doors, cable-lined ceilings and narrow stairways, imagining how several hundred personnel could seal themselves inside for weeks, cut off from the surface yet still actively monitoring the Baltic Sea.

Artillery, Missiles and the View to Sweden

Above ground, the military landscape opens up around you. The most striking features are the big 150 mm coastal guns, originally built for the Atlantic Wall and later moved here to form Stevnsfort’s main artillery. From their positions they could reach targets up to around 23 kilometres away, including the Swedish coast, effectively controlling the gateway between the Baltic and the rest of NATO waters. Scattered around the terrain you also find Hawk surface-to-air missiles, radar installations, searchlights and tanks, all set against wide views over the Baltic Sea. Information panels explain how guns, missiles and sensors worked together: coastal artillery covering the sea, missiles guarding the air, and radar and listening equipment feeding data into the underground command hub.

Atmosphere, Accessibility and Practical Details

On the surface, the museum grounds feel spacious and windswept, with grass, concrete platforms and a few sheltered areas where you can sit with a packed lunch. The welcome building includes a visitor centre, small exhibition spaces and a shop selling drinks, snacks and souvenirs. Restrooms are located here; there are no toilets in the underground complex itself, which is worth bearing in mind before a tour. Access underground is via a flight of around 65 steps, but there is also an elevator that improves accessibility for visitors with limited mobility. Some internal rooms and corridors remain narrow or stepped, so not every area is fully accessible, though manual wheelchairs can be used on parts of the route. The museum recommends warm layers: even on hot summer days, temperatures underground hover around 10°C.

Planning Your Visit to Stevnsfort

Stevnsfort is generally open daily in the main season, with shorter hours and selected weeks open in the shoulder months, while winter often brings a closure period. The outdoor terrain and exhibitions can be explored independently during opening hours, but the underground complex is only accessible on guided tours at set times, so advance booking is strongly advised, especially in summer and school holidays. A typical visit lasts two to three hours, combining a guided tour below ground with time to wander the surface installations and enjoy the sea views. Families should note that prams are not allowed underground, and dogs are only permitted in the open-air areas (service dogs are an exception). With its blend of history, engineering and coastal scenery, the museum works well as a focused day trip or as part of a wider exploration of Stevns Klint and South Zealand.