Beykoz Castle is a historical fortress located in the Beykoz district of Istanbul, Turkey. Built in the 15th century, it served as a strategic military outpost to protect the Bosphorus Strait. The castle features thick stone walls and offers panoramic views of the surrounding area, making it a popular spot for visitors. Today, Beykoz Castle is a significant cultural landmark, attracting tourists and history enthusiasts alike. The site has been restored and includes a small museum that showcases artifacts from its past. Its picturesque setting and historical importance make it a notable destination in Istanbul.