Prompts and Challenges / Travel#A to Z: Istanbul April 11, 2017 - 5 Comments. ShareTweetPin ItShare Istanbul is one of the world’s must visit cities, a remarkable combination of east and west, ancient and modern. The city is such a lesson in history and always a treat for the senses. This post is for the #A to Z Challenge: Letter I. For links to all my #A to Z posts, click here.