Early Christianity - Hagia Sophia, Istanbul
The link address is: https://www.khanacademy.org/humanities/ap-art-history/early-europe-and-colonial-americas/medieval-europe-islamic-world/v/hagia-sophia-istanbul
The link address is: https://www.khanacademy.org/humanities/ap-art-history/early-europe-and-colonial-americas/medieval-europe-islamic-world/v/hagia-sophia-istanbul