In the 19th century, architects drew inspiration from historic styles such as Neo-Romanesque, Neo-Gothic, and Neo-Baroque. New building materials like iron, steel, and concrete enabled new construction types such as train stations, bridges, and factories. A new style called Art Nouveau emerged in the late 19th century focusing on natural forms and integrated arts. Key Art Nouveau architects included Antoni Gaudí in Spain, Hector Guimard in Paris, and Victor Horta in Brussels. Gaudí's highly original works in Barcelona drew on Gothic and organic motifs.