Blue Mosque and Aya Sofia in Istanbul
Perhaps the most obvious places, but it would be a crime not to mention them. Two marvelous mosques face each other in the Sultanahmet district - in the heart of historic Istanbul. The Blue Mosque impresses with its size and the unusually beautiful blue paintings inside. Aya Sofia was originally built as a Christian temple, but during the time of the Seljuk Turks it was converted into a mosque. These sites are on the UNESCO List and on the must visit list of every traveler to Istanbul.
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