Ruin refers to the state of decay or destruction of a structure, object, or concept. It often results from neglect, natural disasters, or human actions. Ruins can be found in various forms, such as ancient buildings, historical sites, or artifacts, and they provide insight into past civilizations and cultures. In archaeology, ruins are significant for understanding history and human development. They can reveal information about architecture, daily life, and societal organization. Famous examples of ruins include the Colosseum in Rome and the Machu Picchu in Peru, both of which attract tourists and researchers interested in their historical context.