Next week's Armidale Express History Revisited column is on the Armidale soap maker George Mallaby. By happenstance, Mallaby visited the 1900 Great Exhibition in Paris where he also seems to have won a gold medal for his soap. The image shows the Exhibition site.
This Exhibition was quite something. Visited by nearly 50 million people, it was a celebration of industry, science and art, with the majority of pavilions built in the Art Nouveau style.
How the Paris World's Fair brought Art Nouveau to the Masses in 1900 from io9 contains some rather good images of the Exhibition. There is also a link in the story to other European Art Nouveau buildings. Have a browse. It's quite fun.