Burg Bieberstein, Medieval castle ruins in Wiehl, Germany.

Burg Bieberstein is a castle ruin perched on a rocky slope near Wiehl that overlooks the valley below. The remaining stone walls display the solid construction typical of a medieval defensive structure from this region.

Bieberstein Castle was first documented in 1341, though a Romanian source gives 1342. By the 16th century its owners were officials dependent on the Lordship of Homburg. It was still inhabited in the mid-19th century, last by a forester, then decayed; stone theft left little of the residential tower by around 1900.

The ruins carry marks of their medieval origins that echo in local stories and regional memory. Visitors can observe how the structure once dominated its surroundings as a defensive stronghold in the valley landscape.

The ruin stands on a 225 m rock slope above the Wiehl valley near Bieberstein in the municipality of Reichshof. Only wall remnants and perimeter walls remain, and the entrance to the cellar vaults can no longer be located, so the site is viewed from outside. The ground is uneven; sturdy footwear helps.

Excavations from the 1930s discovered terraced cellars beneath the ruin structure. Local tales speak of hidden chambers deep underground that continue to spark curiosity among visitors and researchers.