In Assassin's Creed Revelations, which city does Ezio visit to find Altaïr's memories?

In Assassin's Creed Revelations, Ezio visits Constantinople while seeking Altaïr's memories.

Ezio travels to Constantinople, the capital of the Byzantine Empire, to locate keys connected with the Masyaf library. These keys contain memories of Altaïr Ibn-La'Ahad, the protagonist of the first Assassin's Creed. The search links the stories of Ezio and Altaïr and provides the central structure for Revelations.

The game's Constantinople is divided into districts and includes locations on both sides of the Golden Horn. The city is historically significant because Ottoman forces captured it in 1453, but the game takes place in 1511, during the reign of Sultan Bayezid II and the succession struggle involving his sons. Revelations was released in 2011 as the conclusion of Ezio's main trilogy.