walkway on top of a viaduct and view on gaudi house museum in park guell, barcelona

antoni antonion architecture barcelona barrier cast catalan catalonia city coloruful columns court culture designed famous fantasy gaudi gaudí green guell heritage hill house iron lower modern modernist museum natural nature ornate park path shape shrub shrubs site spain spiral spire staircases stone tile tiled tiles top tourism tower travel tree trees unesco uphill viaduct view walking walkway works world