The fourth day took us to Valencia again, but this time to its modern part. We visited the impressive building of the Palau de les Arts Reina Sofía (Opera House), which literally amazed us with its futuristic architecture. We admired the works of the world-famous architect Santiago Calatrava, whose timeless design makes Valencia the city of the future. Our steps also led to the CaixaForum science museum, where we were transported millions of years into the past thanks to a fascinating dinosaur exhibition. We completed the program in  the Museu de la Festa directly in Algemesí, where we understood the depth of local traditions inscribed in UNESCO. It was a day of perfect contrast between ancient history and the modern vision of the world.