On the peak of a steep mountain situated on the right bank of the San river, the ruins of Sobień castle from the second half of the 14th century can be seen. The castle was owned by the wealthy chivalry house of Kmita. Then the Kmita family moved their abode to Lesko, where Piotr Kmita erected a castle in the16 th century, which was subsequently extended by the Stadnicki family. The castle is open to visitors.
An Italian park was established already in the 16th century and continued through the 17th century. In the 18th century the park was planted with lime tree alleys. They are listed in the castle records from that century. In the first half of the 19th century the Krasicki family established a landscape park around the castle.
Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.