Park road, retaining wall under a viaduct; Going far beyond the exuberant use of natural forms in sculpture and wrought-ironwork, which were the hallmarks of Modernisme, Gaudí turned to nature to generate structural form. This was first realized in the Park Güell (1900-1914), Barcelona, part of a garden city commissioned by the textile magnet Güell in pursuit of the reformist ideals of the Renaixença (Catalan Romantic movement). The housing was never built, but Gaudí prepared roads and avenues, projecting viaducts from the hillside on an amazing array of rubble columns like tree trunks, angled to carry the structural thrusts directly to the ground. He also built polychromatic entrance lodges of fantastic form and a vast staircase, with foun...