The Fortress of San Nicolo is a historic military structure located on the island of Lussinpiccolo in Croatia. Built in the 16th century, it was designed to protect the local population from invasions and pirate attacks. The fortress features thick stone walls and strategic vantage points, allowing defenders to monitor the surrounding area. Today, the fortress stands as a testament to the region's rich history. Visitors can explore its ruins and enjoy panoramic views of the Adriatic Sea. The site is a popular destination for tourists interested in historical architecture and military history.