Stone Roadway With Bird Nests In The Park Guell In Carmel Hill, Barcelona, Catalonia, Spain

park guell guell wall gaudi antoni gaudi viaduct stone roadway environment ancient catalonia structure world heritage site terrace walkway spain barcelona tree unesco la salut architecture tourism medieval scenery landmark design nature building destination old bird nest travel natural tourist attraction park peaceful no people getaway daytime public holiday attraction daylight vacation tourist nobody facade carmel hill style