Ruins are parts of buildings, walls, or other structures that have been damaged or destroyed, usually by something like fire, age, or war. Ruins are something that has been used or lived in by people in the past. We often imagine ruins as being old and overgrown with plants, but you can also find ruins from more recent times, like buildings destroyed during World War II. Ruins can tell us a lot about the people who used to live in a certain place, or about a certain culture. Studying ruins can help us understand how people lived in the past.