Gestelnburg, castle in ruins in Niedergesteln in the canton of Valais, Switzerland

Gestelnburg is a medieval castle ruin that stands on a steep rocky ridge above the village of Niedergesteln. The structure features thick stone walls, the remains of a circular tower at its highest point, and traces of residential buildings organized across multiple levels, all once surrounded by a deep defensive ditch.

The Gestelnburg was probably built by the de la Tour family together with allied local knights; it is documented as already standing and owned by the family in 1235. In the second half of the 14th century the family fought Bishop Guichard Tavelli of Sion, whose troops plundered their possessions. After the Upper Valaisans defeated Antoine de la Tour at Saint-Léonard, they took and finally destroyed the castle in 1384.

The castle site was once home to a powerful family that controlled the valley and displayed their authority through the fortress they built. Today, the ruins illustrate how medieval rulers and local communities were connected through land, defense, and regional politics.

The ruins are accessible from the village of Niedergesteln via a marked hiking trail with parking available in the village, though the final ascent is steep and requires sturdy footwear. Entry is free, there are no onsite facilities or wheelchair access, so visitors should bring their own provisions and be prepared for uneven terrain.

The Feschtiloch cave beneath the castle formed during the last ice age; the sources do not mention prehistoric human use. A local legend tells of three corridors, one holding three cauldrons of money guarded by a viper, a toad and a lion, which can be taken only on Christmas Eve after kissing each beast.