Recinte Modernista de Sant Pau

This sprawling hospital complex showcases Lluís Domènech i Montaner's vision of healing through beauty - 12 ornate pavilions connected by underground tunnels, each dedicated to different medical specialties. You'll wander through rooms lined with ceramic mosaics, stained glass windows, and sculptural details that make Casa Batlló look restrained. The operating theater in the Sant Rafael pavilion still has original surgical equipment, while the administration building houses temporary exhibitions about modernist architecture. It's essentially a small modernist city that actually functioned as Barcelona's main hospital until 2009.

The self-guided route takes you through restored pavilions where patients once recovered surrounded by art nouveau masterpieces. Underground passages connect the buildings - originally designed so patients wouldn't see other medical cases, now they provide dramatic architectural reveals. The gardens between pavilions offer breathing space, and you'll often have entire rooms to yourself, unlike the shoulder-to-shoulder experience at Park Güell. The audio guide (included) explains the therapeutic philosophy behind decorating a hospital like a palace.

Most visitors rush through in 45 minutes, but you need at least 90 minutes to appreciate the details. Entry costs €15 (€11 for students), and morning visits mean better light for photos through those stained glass windows. Skip the gift shop - it's overpriced postcards. The real value here is experiencing world-class modernist architecture without fighting crowds, something increasingly rare in Barcelona.