If we still bemoan a world of mass tourism, the mid 19th century, Orlando Figes reminds us, is where it began. Aristocrats were accustomed in youth to prolonged, libidinous grand tours through the Continent (the gap years of their day). For the masses, though, this was the start. ‘During the autumn months,’ grumbled one British newspaper, ‘the whole of Europe seems to be in a state of perpetual motion.’