This book is about the European health spas of the nineteenth century: what they were, how they operated, what life was like there and how their functions evolved to the point where their original medicinal purpose was relegated to a secondary place by the unintended uses of spas as stages of social and political interactions. These popular resorts were nicknamed ‘the summer capitals of Europe’ because of the tendency of nations’ governing classes to gather there. Every summer between 1814 and 1914 (and in a few cases during World War I) continental watering places became a microcosm of cosmopolitan aristocratic Europe, incorporating its conventions, tastes, concerns and interests. As the nineteenth century advanced, fashionable watering stations increasingly became associated with social bonding, matchmaking, pleasure, career building, conspicuous consumption and diplomatic activity that took place during the high season.