There used to be a statue of Constantine the Great atop of this Roman column. The column has been damaged by earthquakes and fires, but it still belongs to one of the most important Roman sights in the city.
Wikipedia https://en.wikipedia.org/wiki/Column_of_Constantine
Address 2/1 Vezirhanı Caddesi, Fatih 34120, Turkey
Coordinates 41°0'30.796" N 28°58'16.658" E