St. Nicholas church from the mid-14th century dominates the Prešov cityscape with tall tower reconstructed in Gothic style. The construction of the church was finished in 1515. Despite of repeated modifications and fire in 1788 many Gothic elements have been preserved in its architecture. The Gothic and Baroque styles alternate on the main altar of St Nicholas from 1696. Statues of angels from the beginning of the 16th century were made in workshop of Master Pavol of Levoča.
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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.