One hundred million years ago, the skies were filled with enormous flying reptiles! With wings spans up to nearly forty feet, pterosaurs were the dominant life form on earth. Learn more about these incredible creatures and the world they inhabited.
Discusses the native Americans known as the Anasazi, who migrated to southwestern Colorado in the first century A.D. and mysteriously disappeared in 1300 A.D. after constructing extensive dwellings in the cliffs of the steep canyon walls.