Built in the 6th century, this building stood as the largest Christian cathedral for 1,000 years and set the standard for Byzantine architecture. For students of architecture and art history, this place alone is worth a trip to our mystery country. It was dedicated to Holy Wisdom, Hagia Sophia in Greek. In the 15th century, it was converted to a mosque, hence the Arabic inscriptions in the dome and hanging medallions and the minarets outside. The building has been a museum since 1935. As of this writing, it is the 2nd most visited museum in our mystery country.

Can you name that county? 
See below for answers.

This mystery country is Turkey.
Click to see Turkey tours.