Frauenalb Monastery was founded in the late 12th century. It accepted as members only daughters of noble families. The accidental fire destroyed the monastery in 1508 and only abbey church built in 1404-1406 survived. The rebuilt monastery was looted again in 1525 during Peasants War.
Shortly after 1600 the last woman left the monastery. Today a foundation takes care of the preservation of the remarkable ruin.
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.