The Blue Mosque, also known as Sultan Ahmed Mosque, is an iconic landmark in Istanbul. Built in the early 17th century, its stunning architecture features a cascade of domes, six minarets, and intricate blue Iznik tiles that adorn its interior. Visitors can explore its spacious courtyard and grand prayer hall, which holds up to 10,000 worshippers. The mosque is active, so visitors should be mindful of prayer times. Located in Istanbul’s historic Sultanahmet district, it sits near other attractions like Hagia Sophia, making it a must-visit site.