Two houses, one block
Casa Batlló and Casa Milà (universally known as La Pedrera, "the quarry," for its rough stone facade) sit a short walk apart on Passeig de Gràcia, both designed by Gaudí within a few years of each other, and both regularly compared by visitors trying to decide whether to pay for one or both.
Casa Batlló
The more visually dramatic of the two from the outside — a rippling, bone-and-scale-like facade covered in broken ceramic mosaic, widely interpreted as a reference to the legend of Saint George and the dragon. The interior leans heavily into immersive, multimedia presentation (projections, augmented reality elements in some ticket tiers) alongside the original architecture.
La Pedrera (Casa Milà)
More restrained and structurally radical — an undulating stone facade with no straight lines and wrought-iron balconies, built around an innovative structural design that removed the need for load-bearing interior walls. The rooftop, with its sculptural chimneys, is the highlight and one of Gaudí's most photographed spaces after Sagrada Família itself. The presentation here is more architecture-forward and less multimedia than Casa Batlló.
If you only have time for one
Choose Casa Batlló if you want the more immediately dramatic, photogenic experience and don't mind a more produced, multimedia-heavy presentation. Choose La Pedrera if you're more interested in Gaudí's structural engineering and want a quieter, more architecture-focused visit, plus the rooftop chimneys.
Tickets and timing
Both use timed entry, though both are generally easier to book close to the date than Sagrada Família or Park Güell — same-week availability is common outside the height of summer. Both also run evening visit options in peak season, worth considering for softer light and thinner crowds.