The document provides an overview of the Art Nouveau movement in various countries across Europe from the late 19th to early 20th century. It began as a reaction against academic styles and sought to integrate all art forms with architecture at its center. Key characteristics included dynamic curved lines inspired by nature. The style was expressed differently in places like Belgium with floral curves, and Vienna which featured simplified geometric designs. Major figures and works discussed include Victor Horta, Hector Guimard, Charles Rennie Mackintosh, and Antoni Gaudi.