In 2016 I looked into doing one of those free layover tours one maybe can get when flying TA. Unfortunately my layover time then would not have let me catch a tour, so I just hung out on the airport. So no recommendation, but if you have not already look into it.
Take a Free Istanbul City Tour During Your Layover
TA also says you can get a free 5 star hotel voucher (if you fly TA)... maybe look into that...
Request Rejected
Overall I was just glad I missed both, the terrorist attack and then also the coup by a week or so... (had 2 layovers of differing length) and in retrospect felt maybe deep in the airport was safer than on a checkpoint in... ... Sure, I would have preferred to do something better, but then it just did not feel right to me...
Take a Free Istanbul City Tour During Your Layover
TA also says you can get a free 5 star hotel voucher (if you fly TA)... maybe look into that...
Request Rejected
Overall I was just glad I missed both, the terrorist attack and then also the coup by a week or so... (had 2 layovers of differing length) and in retrospect felt maybe deep in the airport was safer than on a checkpoint in... ... Sure, I would have preferred to do something better, but then it just did not feel right to me...