The Cathedral Church, also known as St. John's the Baptist Church, was originally built between 1098 and 1132. It has been almost entirely rebuilt, following the original design, after the earthquake in 1743. Inside one can admire a polychrome mosaic from 1178 and a crown in wood from 1594.
Here Ruggiero, son of Tancredi, was crowned King of Sicily in the year 1191, and in the year 1225 celebrations were held for the marriage of Isabella of Brienne, queen of Jerusalem, to the emperor Federico II.
Valuable paintings of several ages are collected in the chapels, sacristy and altars.
A chapel is dedicated to St.Teodoro's relics, the Saint of the city togheter with Saint Lawrence.
It's located side by side to the cathedral's bell tower, that was completed in 1795; from the other side there are the Bishop's palace and Seminary building, built in 1720 by using the materials obtained from the demolished Basilica of Saint Leucio.
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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.