"Casa Grande Ruin" is a research paper in which the author Cosmos Mindeleff tells about the discovery and research of the ruins of the cultural complex of Casa Grande in North America. In his work, he describes in detail the architectural features of buildings, ritual practices and the life of ancient peoples who inhabited this area. The author gives the reader the opportunity to unravel and reconstruct the history and culture of these civilizations step by step. "Casa Grande Ruina" is a fascinating journey into the past, which helps to better understand and appreciate the legacy of ancient civilizations.