One of the biggest tourist attractions and a must-see for all visitors to Sibenik. St. Nicholas is a naval defense fort located on the islet Ljuljevac, at the entrance to the canal of Sv. Ante in front of Sibenik. From July 9, 2017, the fortress of St. Nicholas is enrolled in UNESCO World Heritage List, along with other fortresses called “Venetian Fortresses from the 15th to the 17th Century”. St. Nicholas was erected in the middle of the 16th century at the entrance to the canal. Ante, a real sea passage leading to Sibenik. It is located on the south side of the canal, on the small island, and south is connected by a narrow landing to the land. Its northern side is prominently positioned on the opposite side of the canal, thus making surveillance of the maritime routes of that area. The reason for the construction of the fort of Sv. Nikola was the fall of Skradin town under the Turks’ fortress in 1522. The conquest of Skradin allowed the Turks a favorable position to achieve maritime affairs with the interior of the already conquered territory, which was particularly important for the trade and export of raw materials. In the event of their plan being implemented, the town and port of Sibenik would be endangered, and for one of the most strategically important cities on the Adriatic coast it was not permissible. It was designed by the Venetian military builder Michiela Sammichelle. The lower parts are made of white stone and the upper part of the brickwork. Sv. Nicholas belongs to the strongest fortifications on the Croatian coast, and certainly the most beautiful.