This is St. Nicholas Fortress located in the fjord of Sibenik, Croatia. It is a Renaissance-era coastal defense military building with a triangular bastion shape. The main body of the fortress is built of stone, with mottled traces left by long years on the outer wall, and a small amount of vegetation and dirt paths can be seen in the inner area. The fortress is surrounded by clear blue-green seawater on three sides, connected to a shoal on one side. Yachts and sailboats sail on the water, and the distant islands are covered with dense green vegetation. The overall atmosphere is quiet and full of historical weight, making it a cultural heritage site with both historical value and landscape value.