The Art Noveau (“New Art” in French) was a popular style of art between 1890 and 1910, known as Jugendstil, Modernisme and Secession. In Hungary it was quite popular; some of the country’s most famous architects designed buildings in this style. Some of them were inspired by traditional Hungarian decorative designs, Transylvanian traditions, or Far East (Indian or Syrian) style. Here are 15 of the most famous ones.
Hmm... perhaps I'm only versed in the French Tradition/definition of Art Nouveau, but a lot of this seems Deco/neoclassic to me. You need a strong naturalistic style (elements/angles/curves drawn from nature) for it to be Art Nouveau. Not trying to pick a nit, again I may just not be versed in what the Hungarians call Art Nouveau. To be fair, this is a bit more "Rennie McIntosh" than Mucha/Klimt.