Must see in Istanbul. Built in 530 AD, it is an outstanding architectural marvel. It has stood testimony to some of the sweeping changes of history, few of which happened within its doors. Kinda like an architectural Forrest Gump. Visit and soak it in and read up on the stuff that had gone on here- or read up and go visit, whatever works. Istanbul/Constantinople is a mindblowing crucible of history and the Hagia Sophia is the central piece.
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