Truly Rome is a world: whatever has possessed greatness in the west -art, religion, history- has left its traces in this city. Pagan antiquity, the origin of Christianity and of Byzantine civilization, the struggles and the transformation of the early middle age, the ecclesiastical supremacy of the thirteenth century, the Renaissance of the fifteenth and sixteenth century -all these epochs had Rome for their centre; they covered it with their works, and they live again in it in a crowd of monuments. How many considerable States present us, in comparison with the reminiscences accumulated...