Kanonstilling G3 – WWII Gun Battery in the Forest of Dueodde

Concrete Giant in the Bornholm Pines

Kanonstilling G3 lies tucked into the sandy woodland south of Nexø, where tall pines sway above one of Bornholm’s strangest wartime relics. From the forest floor, the structure appears almost like a buried fortress: thick concrete walls, a vast circular pit and angular embankments rising subtly from the heather and moss. Built by the German military in 1940, this was intended to be one of four huge coastal batteries guarding the southern Baltic Sea.The scale becomes clear as you step closer. The emplacement stretches roughly 30 metres by 40 metres, a broad platform with a circular opening at its heart. Here, engineers planned to mount a naval gun around 17 metres long, weighing over 100 tonnes and capable of hurling enormous shells far across the Baltic. The weapon never arrived, but the empty ring still suggests how dominant this position would have been over the sea lanes south of Bornholm.

Ambitions, Frost and Abandonment

G3 and its twin, G4, were part of an ambitious German plan to fortify Bornholm as a key outpost during World War II. The island’s location made it strategically important as German forces sought to control shipping routes and protect their Eastern Front supply lines. Construction teams began pouring concrete and carving out bunkers in the forest, but the project soon ran into serious obstacles.Labour shortages hampered progress from the start, and the brutal winter of 1940–41 brought record low temperatures that cracked and stalled the works. Faced with technical setbacks and shifting priorities in the wider war, the German command eventually abandoned the scheme. The vast gun pits were left empty; only the stark shells of the emplacements remained, mute reminders of a military vision that never fully materialised.

Echoes of War in a Peaceful Landscape

Today, Kanonstilling G3 is freely accessible, a place where nature and history collide. The once-fierce geometry of the concrete has softened around the edges, stained with lichen and framed by trunks and undergrowth. As you move into the central pit, the sounds of the forest dim, replaced by an odd, cave-like hush created by the thick walls and open sky above.It is hard not to imagine the alternate history these structures suggest. Bornholm played a unique role at the end of the war; even as the rest of Denmark marked liberation in May 1945, the island remained under German control until Soviet bombardments forced a surrender. Though G3’s gun was never installed, the emplacement symbolises how close the island came to becoming an even heavier fortified stronghold at the Baltic gateway.

Exploring Bunkers, Tunnels and Hidden Corners

For visitors, part of the fascination lies in the site’s rawness. Rough stairways, narrow entrances and low passages lead into adjoining bunkers where light falls in dim bands through doorways and cracks. Inside, you may find graffiti, damp walls and scattered sand, but little interpretation; this is more open ruin than formal museum. A torch is essential if you intend to venture into the darker rooms and corridors.Above ground, the emplacement blends into the forest floor, forming a kind of concrete amphitheatre. Children often clamber along the walls while adults study the structure’s layout, tracing cable channels, ammunition niches and firing positions. The experience is tactile and self-guided, inviting you to reconstruct the missing machinery and routines of a wartime battery from the clues in the architecture.

Between Holiday Calm and Wartime Memory

What makes Kanonstilling G3 especially striking is its setting close to Dueodde’s bright dunes and beaches. Within a short distance, you move from soft sand and holiday cottages to stark concrete and shadowy bunkers. The contrast between carefree seaside life and the heavy infrastructure of occupation encapsulates Bornholm’s layered identity.As you leave the gun pit and step back among the trees, the bunker seems to sink once more into its surroundings. Birds call overhead, and the scent of resin and sea air replaces the chill of the underground rooms. G3 lingers as a quiet but powerful memorial: not a battlefield, but a monument to plans that never came to fruition and to an island that has carried the weight of its strategic position long after the war ended.