Burg Schwarzwald, Castle ruin in Schwarzwald, Luisenthal, Germany

Burg Schwarzwald is a ruined spur castle on a narrow ridge at 519 m above sea level, about 60 m above the Ohra valley in Luisenthal. Its 250 m long, 20–40 m wide site is protected by steep slopes and a rock-cut neck ditch about 5 m deep and wide, with a remaining tower stump roughly 20 m high. A 1 m high, 10 m long wall fragment survives beside the hiking path.

The castle originated in the medieval period as a control point for surrounding territories and trade routes. Its position made it an important outpost for local rulers.

The name Schwarzwald here records the spruce and fir forest that covered the ridge in the late Middle Ages, not the Black Forest of Baden-Württemberg. The site is a protected archaeological monument used for forestry and walking; a small monument in the western part, put up after 1870, commemorates the Franco-Prussian War.

The castle site lies on a narrow spur about 60 metres above the Ohra valley, reached from Schwarzwald via a hollow way and a rock-cut neck ditch. The terrain is steep and uneven, with a 20-metre tower stump and a 10-metre wall remnant along the path. An information board of the local heritage association stands on the north side of the ditch.

In the western part of the castle, a small monument was erected after 1870 commemorating the Franco-Prussian War; it stands among the remains of the residential and administrative buildings. The site is a protected archaeological monument, used today for forestry and tourism.