Hagia Sophia is a must-see landmark in Istanbul. Built in 537 as a church by Emperor Justinian, it was the world's largest church for centuries.

After the Ottomans took over in 1453, Sultan Mehmed II turned it into a mosque. In 1935, it became a museum, and in 2020, a mosque again.

Hagia Sophia blends Christian and Islamic features. Inside, you'll find mosaics of Jesus and Mary alongside Islamic elements like the mihrab and minarets.

The architecture features a large dome, tall columns, and golden mosaics. Key features include the Imperial Door and marble columns, an example of Byzantine and Ottoman design.