Anadolu Hisarı is a historic fortress located on the Asian side of Istanbul, Turkey. Built in 1395 by the Ottoman Empire, it was designed to control the passage of ships along the Bosphorus Strait and to protect the city from potential invasions. The fortress features thick stone walls and towers, showcasing the military architecture of its time. Today, Anadolu Hisarı is a popular tourist attraction, offering visitors stunning views of the Bosphorus and the surrounding area. The site also includes a small museum that provides insights into its history and significance during the Ottoman period.