I checked earlier posts but somehow missed the information on this subject. I will be arriving with my group in September by cruise ship (happy to say this is my 5th year in a row visiting Turkey). We will be staying in Istanbul for two days, then flying to Cappadocia for three. After one more day in Istanbul, we will be flying home. Question: do we need a Turkish Visa, and if so, can it be purchased somewhere near the cruise terminal? Looking forward to our return! Thank you!