Pollutants like sulphur dioxide and nitrogen dioxide, generated by both vehicles and industries, react with air moisture to form acids that eat into the marble and result in a change of colour and even holes in these heritage monuments
Hagia Sophia is a masterpiece of human endurance, architectural excellence, craftsmanship, and unparalleled beauty of an edifice in stone with calligraphy and graphics depicting many events. It was a treasured gift from the Byzantine and Ottoman empires, a mesmerizing sight to behold, which sees millions of visitors annually.
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