When it comes to mysterious prehistoric sites, North America’s rich treasure trove of ancient puzzles tend to get overshadowed by more famous examples from Africa, Eurasia, and South America. Earthworks like the Serpent Mound in Ohio, and numerous medicine wheel sites such as Wyoming’s Bighorn Medicine Wheel are but two types of these archaeological enigmas, who’s ages can be disputed due to the difficulty in determining how old the constructions are.
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