A conversation with Sergey Ivanov (Alexander von Humboldt fellow at the University of Munich; corresponding member of the British Academy) on the monuments, buildings, and ruins of the Byzantine phase of the City's history. We talk about how to explore them, how to access their history, and even get a feel for the lingering presence of the events that took place in them. We ponder what has been lost and what might yet be found. The conversation is based on Sergey's recent book In Search of Constantinople: A Guidebook through Byzantine Istanbul and Its Surroundings, tr. by Sara Buzadzhi and D. Hoffman, ed. David Hendricks (Istanbul: The Swedish Research Institute in Istanbul, 2022).