I am an Indian passport holder having a Schengen student visa, I have a layover of 22 hours at Istanbul airport on my flight back to Mumbai from Leipzig, Germany.
I want to know if I need a transit visa if I wish to go sightseeing in Istanbul for those 22 hours. If I need one, then is it a different visa for transit or the same as a normal e-visa? Will I be able to travel on my Schengen visa? I am travelling with Turkish airlines.