Hagia Sophia is a former Greek Orthodox Christian patriarchal basilica, and now a museum in Istanbul, Turkey. It was constructed in 537 AD at the beginning of the Middle Ages.
PHOTO: By Arild Vågen - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=24932378 CONTENT: Wikipedia contributors. "Hagia Sophia." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 14 Aug. 2018. Web. 17 Aug. 2018.