Ayasofya (St. Sofia) - Byzantine cathedral built in 537. Turned into a mosque by Mehmed II (conqueror of Istanbul) in 1453.
View of Ayasofya from outside of The Blue Mosque.
Sultanahmet (The Blue Mosque) - Istanbul's most important imperial mosques. Constructed by Ahmed I during the years 1603-1616.
Inside The Blue Mosque.
Beautiful Turkish ceramic tiling. These pictures do no justice.