Spain has been the home of some of the world's great artists and has museums and galleries to match. In the cities, narrow twisting old streets suddenly open up to views of the daring modern architecture, as a culture of old and new mix and mingle in the city's nightlife. There are endless tracts of wild and crinkled sierra to explore, as well as some spectacularly rugged stretches of coast. Culturally, the country is littered with superb old buildings, from Roman aqueducts to Gothic cathedrals, and almost every second village has a medieval castle. With more than 115 years exploring the globe with its writers, photographers, and research expeditions, "National Geographic" is uniquely positioned to introduce your readers to everything they need to know about the countries of the world.