The main square of the ancient Constantinople where chariot races used to be organized. You can still see its monuments, such as obelisks, here. There are many sights close to this square – Sultan Ahmed Mosque is just a hop, skip, and a jump away and also Hagia Sophia and Basilica Cistern are close by.
Wikipedia https://en.wikipedia.org/wiki/Hippodrome_of_Constantinople
Address 6 At Meydanı Caddesi, Fatih 34122, Turkey
Coordinates 41°0'23.516" N 28°58'33.586" E