The Spanish Pavillion at Expo Zaragoza in 2008.  It’s pretty striking.  I love the interplay between the bamboo-like pillars and the extra-thin roof plane.  Sitting in a pool of water, the pathways through the various enclosed areas — glass boxes screened by the multitude of columns — of the building become a boardwalk romp though a lovely interplay of light, reflection, and shadow.  Inside, multi-story spaces heighten the drama, your eye drawn upward to the underside of the roof lined with richly textured dark cork.

Designed by Francisco Mangado.