Ehrenhausen Castle is well-preserved three-story and four-wing building from the 12th century. The castle was first mentioned in 1240. The current castle was built by the Eggenberg family in the 16h century. It was one of Austria′s numerous fortifications that secured the South and the East of the country against the Turks.
On the castle hill there is also the mausoleum of Ruprecht von Eggenberg (1546-1611) and his nephew Wolf von Eggenberg which was designed by Italian painter and architect Giovanni Pietro de Pomis.
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.