La Pedrera - Casa Milà

Completed in 1912, Casa Milà takes its nickname, 'La Pedrera' or 'the quarry,' from its rough, undulating stone façade, which drew ridicule from contemporaries used to more conventional apartment buildings. Structurally innovative for its time, it has no load-bearing internal walls, allowing for the flowing, irregular room layouts Gaudí favored.

Its rooftop terrace is the highlight for most visitors, populated by twisting, helmet-like chimneys and ventilation towers that feel more sculptural than functional. An apartment preserved in period style and an exhibition on Gaudí's working methods round out the visit for those interested in his broader career.