Montjuïc held two world's fairs sixty-three years apart, and this walk strings the leftovers together: 1929 at the bottom of the hill, 1992 at the top, four kilometres of monuments built to be looked at. Go in the afternoon, when the light flatters the white stone and the crowds thin toward closing.
Start at Espanya, with the Font Màgica de Montjuïc framing the climb. Step right for the Mies van der Rohe Pavilion — the rebuilt 1929 masterpiece in onyx and travertine — then across to CaixaForum, a Modernista factory now full of art. The escalators lift you to the MNAC in the Palau Nacional, where the Romanesque frescoes are the real surprise and the terrace is a free balcony over everything. It's shut on Mondays; don't waste the trip.
Past Poble Espanyol's gateway, the hill flattens into the Anella Olímpica — the 1992 stadium with its kept facade, the great empty esplanade. End at Calatrava's white tower, a torch-bearer in concrete, and take the funicular down to Espanya.

