Klevevž Castle, Castle ruin in Grič pri Klevevžu, Slovenia.

Klevevž Castle, first mentioned in 1306 as Castrum Chlingenuelz, was built from 1265 on a rock above the left bank of the Radulja stream. Its core was a four-sided tower, later rebuilt and extended; a residential building with a chapel stood by 1449. Today only fragments of the castle wall above the Radulja rapids, the farm buildings and traces of the park remain, with the old castle mill by the reservoir at the foot of the falls.

The Freising bishop Konrad had the castle built in 1265 on a rock above the left bank of the Radulja, with the approval of Duke Ulrik III of Spanheim; it was first explicitly mentioned in 1306 as Castrum Chlingenuelz. The original structure was a square tower, later rebuilt several times. In 1412 the Freising bishop Herman of Celje handed it to his father Herman II, and after the Celje line died out the Freising bishops regained it. In 1475 and 1476 Ottoman forces besieged it unsuccessfully, and in 1942 Partisans burned it.

The castle gave its name to the Klevevž lordship, first recorded in 1267. Today only fragments of the castle wall above the Radulja rapids, the farm buildings and traces of the park remain. The former castle mill by the water reservoir at the foot of the Radulja falls still stands, though it no longer operates.

The ruins stand on a rock above the left bank of the Radulja stream, reached from Grič pri Klevevžu; only fragments of the castle wall above the rapids, the farm buildings and traces of the park survive. The former castle mill by the water reservoir at the foot of the Radulja falls is well preserved but no longer operates. The lower cave by the spring holds a thermal spring.

The castle grounds connect to two nearby caves, with the lower cave containing a rare thermal spring. This natural connection creates an intersection between medieval construction and underground geological features.