📜 Largest pre-Columbian settlement north of Mexico, UNESCO World Heritage Site since 1982. Ancient postholes demarcate the orbit of the Woodhenge, recreated with cedar posts in Illinois. 🔍 Features Monks Mound, the largest prehistoric earthwork in the Americas, and a prehistoric timekeeping pattern (Woodhenge) dating 900-1100 AD. # Why Go 🏛️ Explore ancient Mississippian culture and history 🚶 Walk among impressive earthworks and mounds 🌳 Enjoy grounds open daily from dawn until dusk 🔭 Observe the equinox and solstice replica (Woodhenge) and witness wooden markers align with the sun a few times a year 🕰️ Explore a prehistoric timekeeping pattern # Why Avoid 🚧 Interpretive Center (Museum) closed for most of 2025 due to renovations. 🚫 Interpretive Center also closed on Mondays and Tuesdays (when open). # Tips 🐕 Dogs must remain on a leash at all times on the grounds. 💡 Start at the Interpretive Center (when open) for exhibits and introductory film. 🗺️ Maps & brochures available near Monks Mound Parking Lot & Interpretive Center. 📍 Woodhenge is located directly next to the road, easy to find. 🌞 Visit a few times a year to see Woodhenge markers align with sunrise/sunset. # Cost 💰 Free entry, donations welcome. # Hours 🕒 Grounds open daily dawn until dusk. Interpretive Center (museum) daily 9:00-17:00 (when open), closed Thanksgiving, Christmas, New Year. # 🅿️ Parking Available near Monks Mound Parking Lot. # 🚻 Toilets Vault toilet available near Monks Mound Parking Lot. # ♿ Accessibility Paved paths and ramps for easy access to main parts of the site.