St. fortress Nicholas in Šibenik is part of the fortification system including three other fortresses. They have been on the UNESCO World Heritage List since 2017. St. fortress Nicholas is at the entrance to the channel of St. Anthony and is considered the most valuable and best preserved example of defensive architecture in Dalmatia.
This fortress was built in the mid-sixteenth century, and its purpose was to protect the city from attacks from the sea. The fortress was equipped with 32 cannons. It was designed by a Venice-based builder, Michele Sanmicheli. It has stone foundations, but the building itself was made of bricks, because this material was considered more resistant to cannonball impacts.
Over the centuries, it has been modernized and rebuilt many times. Particularly serious reconstruction was made in 1832. It was eventually abandoned by military forces in 1979.