Idstein Castle, Medieval castle in Idstein, Germany.

Idstein Castle is a fortress complex with a Renaissance palace and a distinctive bergfried tower rising 42 meters high, perched on a rocky ridge in the town center. The complex spans several areas connected by a stone bridge, which together form the historical fortification.

The original fortress was built around 1170 as the seat of the Counts of Nassau-Idstein. Over the centuries, the complex was repeatedly modified and eventually gained its current appearance during the Renaissance period.

The castle displays Renaissance features in its rooms, particularly in ceiling paintings and stucco work created by Italian artisans. These details reflect the wealth and taste of the family that once ruled the region.

The castle houses the Pestalozzi-Gymnasium, a secondary school; the schloss and Hexenturm can be visited on request. Guided tours are offered with guides dressed as gardeners of 1702. The complex is reached on foot from Idstein's old town.

The 20-metre stone bridge over the neck ditch links the outer bailey, now the Renaissance schloss, with the upper bailey. Beside it, opposite the bergfried, lies a small Renaissance garden. Guided tours are led by guides dressed as gardeners of 1702.