A long period of decline in the eleventh century, Muslim Turkish invaders seized all of the empire Asian provinces, removing the most important sources of taxes and food. The Crusaders in 1204 stole Constantinople. By 1453 the Turks conquered Constantinople.
The service offers a detailed map of the country that includes built-in traffic maps as well as panoramic street images of Istanbul and Ankara. Description from usbuzzblog4.blogspot.co.uk. I searched for this on bing.com/images