Ключевые слова: agriculture, american history, ancient, ancient astronomy, background, beautiful, blue, built to last, burial mound, cemetery, countryside, culture, dramatic sky clouds, earthworks, engineering, environment, farm, field, grass, green, growth, historical background, historical place, hopewell culture, journey, land, landscape, meadow, mound, mound city, mound of earth, native american, native american culture, native american design, natural, nature, ohio, outdoor, person, plant, prehistoric art, rural, sacred space, science, season, sky, spring, summer, tree, view,