GALATA, ACROSS THE GOLDEN HORN

VIEWED FROM THE MOSQUE OF SULTAN SULEYMAN THE MAGNIFICENT

Sadly, modern buildings to the north mar the old world skyline of Galata.
At least the modern buildings are relegated to farther flung spots on the European and Asian parts of Istanbul, so they do not mar the Old Town structures that date to Byzantine and Ottoman times.

AYASOFYA

TURKEY'S MOST-VISITED ATTRACTION

In 1453, Constantinople was conquered by the Ottoman Turks under Sultan Mehmed II, who ordered this main church of Orthodox Christianity converted into a mosque. 

By that point, the church had fallen into a state of disrepair. Nevertheless, the Christian cathedral made a strong impression on the new Ottoman rulers and they decided to convert it into a mosque.

The bells, altar, iconostasis, and sacrificial vessels and other relics were removed and the mosaics depicting Jesus, his Mother Mary, Christian saints and angels were also removed or plastered over.

Islanic features—such as the mihrab, minbar, and four minarets—were added.

It remained a mosque until 1931, when it was closed to the public for four years. 

It was re-opened in 1935 as a museum by the Republic of Turkey. 

--Courtesy, Wikipedia