Siena Cathedral unfinished facade, Siena, UNESCO World Heritage Site, Tuscany, Italy, Europe

siena cathedral unfinished facade tuscany europe panoramic view historical architecture unesco heritage sky city tourism landmark sightseeing culture travel italian architecture scenic beauty historical site stone building structure design artistry monument religion faith travel destination exploration picturesque ancient open space engineering community heritage site roofless ruins courtyard skyline tradition art tourism spot clouds horizon rustic beautiful view history legacy architectural beauty