Most urgent is the preservation of its iconic dome, the underside of which is covered in mosaics, making structural ...

Building buttresses to support your heavy dome is a good solution -- but it won't work here. When the magnificent Turkish cathedral Hagia Sophia collapsed only 20 years after it was built ...

Turkey's Hagia Sophia will open to visitors outside prayer times and its Christian icons will remain, religious officials said on Tuesday, after a court ruling paved the way for it to become a mosque.