Ruby Falls is a high underground waterfall located within Lookout Mountain, near Chattanooga, Tennessee in the United States. - Ruby Falls and the larger Lookout Mountain Caverns complex have been designated a National Historic Landmark.
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.