my visit to the famous Sultan Ahmet Mosque in Istanbul has opened up my eyes to a different kind of light - artificial ones. It is very rare for me to even recognise the beautiful use of artificial lighting in any old landmark buildings.
Not far from Selçuk is Didim. Today Didim is a seaside town popular with Ankara Turks and Northern English Brits but two and a half thousand years it was the site of an ambitious building project that so very nearly edged the Temple of Artemis off its spot on the famous wonder list.
What makes Hagia Sophia great? There's many - from the scale of the building to the designing of its interior. Everything that evokes a sense of tranquility and spirituality.