One of the absolute must-see sights in Valencia is the cultural complex known as the Cuitat de Les Arts I Les Ciencies. This architecturally astonishing section of Valencia houses the largest Oceanarium in Europe, a science museum, a multifunctional concert/sports venue, an opera house, a planetarium, and a gorgeous botanical and sculpture garden known as the Umbracle.
Everything was designed by the famous Spanish architect Santiago Calatrava in the 1990s, and it's all white. The end result is that the water features look amazing, and the dark foliage contrast nicely. This is a beautiful part of town, and it's easy to spend all day wandering the complex and surrounding gardens. It was definitely one of my favorite parts of Valencia.