Budget 1.5 to 2 hours to comfortably explore this massive, 16-pavilion Art Nouveau heritage site. Architecture enthusiasts wanting to read every historical exhibit will likely need 2.5 hours.
Suggested route: Start in the Hypostyle Hall while it's still quiet. Take the underground tunnels immediately after, before the garden areas become busier. Move through the Sant Salvador Pavilion for historical context, then into the garden loop, finishing with the outer pavilions.
Must-see: The Hypostyle Hall, the underground tunnels, and the Sant Salvador Pavilion exhibition. Those three cover the full picture: the beauty, the engineering, and the history.
Optional: A slow garden loop and the outer pavilions add 30 to 45 minutes. Worth it if you have time and want the best photography angles on the domed rooflines.
Self-paced vs. audio guide: Self-paced works well because the site is well signposted. An audio guide at €4 from the box office adds the most value if you want architectural symbolism and hospital history context that isn't spelled out in the rooms.
