Where would you find Hagia Sophia, the former Greek orthodox Christian patriarchal cathedral, later an Ottoman imperial mosque and now a museum?

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Question:

Where would you find Hagia Sophia, the former Greek orthodox Christian patriarchal cathedral, later an Ottoman imperial mosque and now a museum?

Options :

Riyadh, Saudi Arabia
  Istanbul, Turkey  
Athens, Greece
Jerusalem, Israel

ANSWER - Istanbul Turkey.

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