Schwarzenbourg Castle - Ruins

Perched at 560 meters altitude on a hill overlooking the Munster valley, near Griesbach-au-Val, Schwarzenbourg Castle reveals itself after about a 40-minute uphill walk through a dense, dark forest. Although now a ruin, it was once considered the most advanced military construction in Alsace during the Middle Ages, gradually losing its initial prestige while retaining an imposing and strategic architecture.

Outside, the remains of the building show fragments of ramparts and sections of the first line of defense walls scattered among the trees. Further on, the remains of the curtain walls, protected by a ditch, still emerge. Despite their advanced state of decay, these walls maintain remarkable height and thickness, perfectly illustrating medieval military engineering. The castle is shaped like an almost rectangular parallelepiped, reinforced by a thick shield wall. Flanking towers, though partially collapsed, structure this rigid architecture, while a larger tower, likely the keep, occupied the most exposed point to attacks.

Inside, no trace of the original buildings is visible: earth and vegetation have erased the foundations of the inner walls. Yet two unusual elements catch the eye. First, looking up at the top of the curtain walls, the remains of the wall walk can be seen, evidence of the guards' patrol route. Second, leaning against a medieval wall, a 20th-century concrete bunker seems to blend into the landscape. Built a thousand years apart, this block may have unexpectedly helped reinforce two walls of the old fortress.