Hagia Sophia is Istanbul's most famous landmark
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The current renovation is the first global makeover of the centuries-old building
Hagia Sophia has been a church, mosque, museum and now a mosque again
Foreign visitors at the site generate millions of euros' worth of revenue each year
The Hagia Sophia of Istanbul is no stranger to change -- through the centuries the city's architectural jewel has gone from church to mosque t…
The ancient cistern had been modified to include a jacuzzi-style swimming pool, sauna and massage rooms and a hammam
Turkish authorities have sealed off a luxury spa run by a five-star Istanbul hotel that was set up by illegally modifying a 1,500-year-old cis…