Defined by its differences, Spain consists of several autonomous regions with unique cultures and languages. See royal treasures in Madrid and unique architecture and Catalonian flair in Barcelona. Sample paella in Valencia, party the night away on Ibiza or soak up the sun along the Costa del Sol in the south. There’s a Guggenheim in Bilbao, the Alhambra in Grenada and a medieval city in Toledo. Michelin-star restaurants and great wine beckon in San Sebastian and the Rioja region in the north.