Rumeli Hisarı is a historic fortress located on the European side of the Bosphorus Strait in Istanbul, Turkey. Built in 1452 by the Ottoman Sultan Mehmed II, it was strategically positioned to control maritime traffic and protect the city from potential naval attacks. The fortress features impressive stone walls and towers, showcasing the military architecture of the time. Today, Rumeli Hisarı is a popular tourist attraction, offering visitors stunning views of the Bosphorus and the surrounding area. The site also hosts cultural events and concerts, making it a vibrant part of Istanbul's rich history and heritage.