Gaudí's hilltop park is one of Barcelona's most visited sites, and for good reason. Commissioned by industrialist Eusebi Güell as a residential garden city, the project was a commercial failure but an artistic triumph. The main terrace, lined with a serpentine mosaic bench, offers sweeping views over the city to the sea. Below it, the forest of tilted stone columns in the Hypostyle Hall feels like walking through a geological dream.
The monumental zone (the famous terraces and mosaic areas) requires a timed ticket — book online in advance to avoid disappointment. The surrounding park grounds are free and worth exploring for their stone viaducts and quieter paths through Mediterranean vegetation.
Take bus 24 from Plaça de Catalunya or walk up from Lesseps metro. The bus drops you near the top entrance, saving you a steep climb.