Sira Castle, also known as Sira Fortress, is a historic castle located on a small volcanic island called Sira Island in the harbor of Aden in Yemen. It’s an ancient fortress that dates back to the 11th or 12th century and was used as a defensive stronghold for the port city. The fortress was later renovated and expanded by the Portuguese in the 16th century when they took over the island. The strategic location of the castle overlooking the harbor allowed it to control the maritime traffic entering and leaving the port, making it a critical point for trade and military purposes. The castle's construction is a blend of medieval Islamic architecture and Portuguese influences, reflecting the region’s complex history of conquests and trade. The island can be accessed by a causeway linking it to the mainland. Although the castle has suffered damage over the years, it remains a symbol of the rich history of Aden and Yemen. Unfortunately, the political situation and conflicts in Yemen have limited access and conservation efforts for this historic monument.