The church on the site of current San Dalmazzo is documented from the 11th century, but the present church was reconstructed in 1702. In 1885 the interior was redecorated in neo-gothic style. Adjacent to the church is the former convent and school of the Barnabite order. From 1271 to 1606, the church had been linked to the Order of Canons Regular of Sant'Antonio of Vienne, but then was transferred along with the convent to the Barnabites.
The nave was painted by Enrico Reffo in 1895–1916. The interior also contains 18th century canvases and an antique baptismal font.
Between 1629 and 1631 the chapel of the Madonna of Loreto was built, imitating the Casa Santa (Holy House), which contains an icon related to Marian Apparitions.
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.