Casa Vicens, Barcelona

Casa Vicens in the Gràcia district, Gaudí's first house, begun in 1883 as a summer home for Manuel Vicens. It looks nothing like the flowing buildings he became famous for: straight lines, Moorish turrets and a checkerboard of green and white tile. Look for the small orange flowers repeated on the tiles, a marigold motif. A private home for most of its life, the house opened to visitors as a museum in 2017, so its painted interiors are now part of any Gaudí trip.