Hagia Sophia is a timeless masterpiece and one of Istanbul’s most treasured landmarks. Built in 537 as a Byzantine cathedral, it was the world’s largest building of its time and a marvel of engineering. Later, it was transformed into an Ottoman mosque, blending Islamic art with Christian mosaics. Today, it serves as a museum and a spiritual site, attracting millions of visitors annually. From its grand dome to intricate calligraphy panels, Hagia Sophia offers an unforgettable journey through the heart of Istanbul's diverse cultural and architectural history.