Standing stones are large, upright stones that are often found in groups or rows. They are typically made of granite, sandstone, or other durable materials and can vary in size and shape. Many standing stones date back to prehistoric times and are associated with ancient cultures, serving various purposes such as markers for burial sites or ceremonial locations. These stones are commonly linked to megalithic structures, which include stone circles and dolmens. Some famous examples of standing stones can be found at sites like Stonehenge in England and Carnac in France. Their exact purpose remains a topic of research and debate among archaeologists.