Ключевые слова: airliner trail, architecture, attraction, beautiful, blue sky, building, chemistry lab building facade, city, cityscape, contrail, cornice, destination, education, europe, experiments, historic, landmark, long format, monument, old town, outdoors, people, portugal, portuguese, research institutions, scenery, schools, science, southwest europe, technological research, top, tourism, town, travel, universities, university of coimbra, urban, visitors, wake,