The most famous and well-preserved effigy mound, called the Great Serpent Mound, is located near present-day Peebles, Ohio, where it can still be seen today.
Dating from the time of the Adena Culture, the mound is about 5 feet tall, 20 feet across, and nearly a mile long. From the air, it looks like a gigantic uncoiling snake with its mouth open, ready to swallow an egg.
The mound may represent the horned serpent, a character in many Indian stories.
