Doorway, Art Nouveau ceramic building at 29 avenue Rapp, Paris The architect of this amazing Art Nouveau building with ceramic ornamentation was Jules Lavirotte. Read more about him here: en.wikipedia.org/wiki/Jules_Lavirotte
This Art Nouveau interior was designed by Alphonse Marie Mucha in 1900 for Parisian jeweler, Georges Fouquet. The interior has been reconstructed in the Musee des Arts Decoratifs in Paris to preserve its beauty and artistic importance.
Art Nouveau Architecture in Brussels, 6 Rue du Lac I believe I have this same home in a night shot in my pins, just not sure which catagory. I am hoping it is this one
Art Nouveau door, Rue Bellevue 46, Brussels, Belgium. Architect : Ernest Blérot