Fairy mounds, also known as fairy hills or tumulus, are small, earthen mounds found in various cultures, particularly in Celtic folklore. They are often believed to be the homes of fairies or other supernatural beings. These mounds are typically circular and can vary in size, sometimes featuring a grassy top or a ring of stones. In many traditions, fairy mounds are considered sacred places where humans should not disturb the land. It is said that entering a fairy mound can lead to misfortune or encounters with magical creatures. As a result, these sites are often surrounded by myths and local legends, adding to their mysterious allure.