Burg Ravensberg, Medieval castle in Borgholzhausen, Germany.

Burg Ravensberg is a partly preserved hilltop castle on a 269 m hill about 2.5 km south of Borgholzhausen. Its round bergfried, roughly 20 m high, rises beside a lower building of dark squared stone with a slate roof, stepped gable and white-framed windows. The tower has a drop-shaped plan, with the attack side drawn to a sharp corner so projectiles would glance off.

The fortress was founded around 1080 as a residence for the Counts of Ravensberg. Over time it transformed from a family stronghold into an administrative center that helped govern the surrounding territory.

The fortress is closely tied to the Ravensberg territory, which was once governed from this hilltop location. The buildings and grounds remain central to understanding how noble families shaped this part of Germany.

The site is accessible by several hiking paths that wind through the landscape around Borgholzhausen. A combination of shorter walks and longer forest routes makes it adaptable to different visitor fitness levels.

The keep's floor plan is teardrop-shaped: the side facing attack narrows to a sharp corner so that thrown projectiles would glance off. The tower was rebuilt in 1646 during the Thirty Years' War, when the castle changed hands several times, and the last garrison left in 1662. It stands about 20 metres high and can be climbed again.