What was fresh, modern and ground-breaking in the decades between 1890 and 1910? Art nouveau architecture is a diverse subject, with a plethora of different names from across the globe. But no matter what it is called, it always strives to be different. Defining a movement that consciously opposes tradition is difficult; art nouveau rejects categorisation with its relentless modernity. A conscious defiance of classicism, this movement was informed by niche interpretations of medieval imagery, such as Wagner's operas and Nietzsche's review of paganism, as well as influences beyond the scope of Western canon such as Japanese art and orientalism. The buildings themselves are models of collaborative research. Artistic innovation collided with invention, as architects embraced new construction techniques, designing with iron, glass, pottery, and concrete. This over-sized book is the result of five years in-depth research. It contains a selection of key buildings from around the world, caref