Art Nouveau Tour of Barcelona. This is Casa Batllo, designed by Gaudi. Spain was not drawn into WW I and as such during that time, had prosperity. As as result, there are over 400 Art Nouveau structures in Barcelona.
Castle Drachenburg, Germany Schloss Drachenburg is a private villa in palace style constructed in the late century. It was completed in only two years on the Drachenfels hill in Königswinter, a German town on the Rhine near the city of Bonn.