Palau Güell rooftop, Barcelona

The roof of Palau Güell, where the severe facade gives way to color. The tall stone-clad cone with the gilded weathervane sits over the dome of the main hall below and lets light into it, and around it stand twenty chimneys, many wrapped in broken-tile mosaic. This roof is an early try-out of the colorful rooftops he later built at Casa Batlló and Casa Milà, and visitors to the palace can walk out among the chimneys.