The Blue Mosque.
The Sultan Ahmed Mosque is a historical mosque in Istanbul, the largest city in Turkey and the capital of the Ottoman Empire (from 1453 to 1923). The mosque is popularly known as the Blue Mosque for the blue tiles adorning the walls of its interior.
It was built between 1609 and 1616, during the rule of Ahmed I. While still used as a mosque, the Sultan Ahmed Mosque has also become a popular tourist attraction.
Here's a picture of our group, with our Acacia guide Ali, overlooking the Bosphorus, a 20-mile-long strait which joins the Sea of Marmara with the Black Sea in Istanbul, and separates the continents of Europe and Asia.