Three of the most famous and celebrated residential buildings designed by Antoni Gaudí. Casa Vicens (1883–1885) is Gaudí’s first major work, built when he was in his early 30s, marking the very beginning of his distinctive style. Located in the Gràcia neighborhood of Barcelona, it’s far more angular and geometric than his later organic works, showing strong Moorish and Oriental influences. Casa Batlló (1904–1906) is a remodel of an existing building that Gaudí transformed into something almost otherworldly. The facade is clad in shimmering mosaic tiles of blue, green, and violet, and the roof undulates like the back of a dragon. The bone-like columns and skull-shaped balconies on the lower floors give it an eerie, skeletal quality. Casa Milà (1906–1912) — nicknamed La Pedrera (“The Stone Quarry”) by locals — is made of undulating limestone with no straight lines, giving it the look of a natural cliff face. The rooftop is its most iconic feature: a surreal landscape of warrior-like chimneys and ventilation towers, which famously inspired the stormtrooper helmets in Star Wars, according to George Lucas. Structurally, it was revolutionary — Gaudí used a self-supporting stone facade and open floor plans with no load-bearing interior walls.