Hagia Sophia, Museum in Istanbul, Turkey
The Hagia Sophia is a grand structure with a dome that appears to be miraculously suspended in the air.
Originally built as an Eastern Orthodox cathedral in 537 AD, it was later converted into a mosque and then a museum.
It's a symbol of the long and diverse history of Istanbul, having served as a place of worship for different religions.
Today, it's a popular tourist destination attracting millions of visitors each year.
Its stunning mosaics, which were plastered over when it was a mosque, have been gradually revealed and restored.
Location: Fatih
Location: Istanbul
Inception: December 27, 0537
Founder: Constantine the Great
Architects: Isidore of Miletus, Anthemius of Tralles, Trdat the Architect, Mimar Sinan
Official opening: 1054
Architectural style: Byzantine architecture
Source: Wikimedia