Built between the 1st and 2nd centuries AD, The Roman Amphitheatre of Venosa was deprived of many works and ornaments, which are currently located in other monuments in Venosa (many were used to erect the adjacent incomplete church). The first excavation was commissioned in the 19th century, where a series of bronzes, coins, and terracottas were found, but due to neglect, the ruins were buried again. Only in 1935 was everything brought back to light.
The Roman Amphitheater has an elliptical shape, with three levels, partly built above ground and partly created by terracing the ground on which it stands. The major axis measures 70 meters, while the minor axis is 40 meters. Based on these measurements, it is believed that this structure could accommodate approximately ten thousand spectators in its time. The lowest level is that of the arena, where the terrace of the 'podium' for important figures is located. There are two additional levels, supported by three concentric ambulatories.
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.