Rome is my favourite city in the world. It's not an easy city to appreciate at first try, being noisy, dusty, and often hot and crowded. But in every trip I have made - over 20 years there must have been 100 - I have found something new to see or appreciate or learn. The uniqueness of this city lies in the layering of history, and all in the context of a modern, thriving city, so that it has not become a relic or a museum piece like Venice. This is a gritty metropolis, where the evidence and drama of human life lived at a similar intensity over 2500 years is all around you. From the Romans of the Republic to the Romans of the empire; through the Byzantine dark ages to the medieval popes; to the Renaissance and the baroque period, then italy of the Grand Tour and the Risorgimento; and right up to Mussolini and the present day - all roads lead to Rome, if not the cradle then at least the nursery of western civilisation. Wander the streets and look at the buildings - 17th century apartment blocks will often have old bits of roman temples embedded in their walls. The stock exchange has as one wall the columns of Hadrian's temple. Meanwhile San Clemente, a spectacular church near the Colosseum, has three distinct ...