A tumulus is a type of burial mound, often constructed from earth and stones, that serves as a grave marker. These mounds can vary in size and shape, and they are typically found in ancient burial sites. Tumuli were used by various cultures around the world, including the Mound Builders in North America and the Celts in Europe, to honor the deceased. The construction of a tumulus often involved placing a burial chamber within the mound, where the remains of the deceased were interred. Over time, tumuli have become important archaeological sites, providing insights into the burial practices and social structures of ancient civilizations.