The Archaeological park of Scolacium hosts the ruins of the ancient Greek City of Skilletion that became a Roman colony after the war against Hannibal, and assumed the name of Minervia Scolacium. Little remains of the pre-Roman settlement, while the structure of the Roman colony and rests of paved roads and aqueduct, of the thermal plant, the amphitheater and the theater are still visible. The theater lies on a natural hill slope and could seat about 5000 people. It was built during the 1st century AD, and was equipped with a new scene when the new colony was founded by Nerva.
In the same period, the town became a considerable monumental center with developed built-up areas. The theater was subject to successive renewals till the 4th century AD. Most materials discovered during digging campaigns come from the theater and include remarkable architectural fragments and sculpted groups. Close to the theater, rests of the amphitheater were found, whose construction dates back to Nerva times. The Park also hosts the Basilica of Santa Maria di Roccella, founded between the 11th and 12th centuries following the canons of the Romanic art with Byzantine and Arab influences.
References: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.