Truly great architecture has its own personality. The best buildings are not merely structures with walls, doors and windows. They tell you something about how they were made and the character of the places they were built. When I saw Flickr user scottmschutlz’s playful photo, I immediately knew it was taken at Gaudi’s Casa Milà in Barcelona. The fluid curves of the cement and quirky human-like face of this sculpture tip their hat to the whimsical, artistic traditions of this favorite Spanish city.