Ciudad de las Artes y las Ciencias, Valencia

When Valencia diverted the course of the river that had repeatedly flooded the city, it was left with a broad, flat riverbed spanned by bridges. It was upon this clean palette that the brilliant Spanish architect Santiago Calatrava created a breathtaking ensemble of structures that have become a magnet for aficionados of contemporary architecture. Not only the buildings, but the museums, arts venues, and aquarium (by Félix Candela and the only building not designed by Calatrava) form a series of tourist attractions that rank among Spain's most popular. Europe's largest oceanographic aquarium, L'Oceanogràfic, was built in the shape of a water lily with buildings dedicated to different aquatic environments from the tropics to the poles.