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Twice a year (May and Sep) a special walking tour takes visitors through some of the usually-unseen parts of the site. Normally conducted by an archeologist and author who has worked at Cahokia for over 35 years, the three-hour tour is considered the best opportunity to really learn about Cahokia and its past. The group is also accompanied by a naturalist who points out which plants are native to the area and how they were used in prehistoric times.