My husband and I travelled with some friends, all children left at home and excitement pitched high. Brimful of enthusiasm for Ottoman romance and bazaar shopping, we headed straight to the oldest part of Istanbul, the Sultanahmet. Perhaps the city’s most iconic landmark is here, the Hagia Sophia. Begun by one of Constantine’s successors, Justinian, in the sixth century, it was the largest cathedral in Christendom for over a thousand years, before being reconsecrated as a mosque in the 15th century when the city fell to the Ottomans. It’s now a museum. Despite a decent amount of scaffolding, as restoration is in progress, we stood transfixed under the 100ft span of the great dome.