Visit Yerebatan Underground Palace, one of Istanbul's tourist attractions. A place where "Sisters Over Flowers" program took a shoot too.
Basilica cistern not only a place where you can find ancient wonders but also seeing yourself some spots that were used as movie shooting location. A place where you can explore several hundred ancient cisterns that lie hidden beneath the city of Istanbul.
If you ever watched Tom Hanks movie which is the adaptation of Dan Brown's thriller inferno in 2016 you will see underground cistern where he was down there. Not only that, you will also see this basilica cistern in the James Bond movie called from Russia with love. It will be great if you can experience it personally by visiting the basilica cistern where you can also see the two creepy medusa heads at the base of the columns.