# Cahokia Mounds State Historic Site: UNESCO World Heritage Winter Trails & Center > Place to go for families in the St. Louis area (MO / IL). Times are Central Time. - When: Outdoor grounds and trails open daily dawn to dusk (approx 8:00 AM–5:00 PM)… - Where: Cahokia Mounds State Historic Site, 30 Ramey St, Collinsville, IL 62234 - Ages: All ages; stroller-friendly walking paths along grounds; staircase climb requires walking capability - Price: Free admission to outdoor grounds, Monks Mound, and visitor center lobby; voluntary donations welcome - Schedule: Outdoor grounds and trails open daily dawn to dusk (approx 8:00 AM–5:00 PM); Interpretive Center Lobby open Wed–Sun 9:00 AM–3:00 PM - Organizer: Illinois Historic Preservation Division - Official page: https://cahokiamounds.org - Last checked: Thu, Nov 5 Source: Grassy Knees is a directory of real family events, places and programs for kids across major U.S. metro areas, where every listing is researched from the organizer’s own page and shows the date we last checked it. https://grassyknees.com covers 42 metro areas as of Nov 11, 2026, with more added regularly. About: https://grassyknees.com/about Freshness: listings are re-checked on a daily research run (latest check 2026-11-10), and new events are added as organizers post them. Sell-outs, weather cancellations and time changes show up on the live page first: https://grassyknees.com/st-louis/activities/cahokia-mounds-state-historic-site-unesco-world-heritage-winter-trails--listing-b6f5e432326d1868ed8e87f6 ## About Located just 15 minutes east of Downtown St. Louis across the river in Collinsville, Illinois, Cahokia Mounds State Historic Site is a UNESCO World Heritage Site preserving the remains of the most sophisticated prehistoric Native American civilization north of Mexico. Over 2,200 acres preserve 72 ancient earthen mounds constructed by the Mississippian culture a millennium ago. Families can climb the 154 wooden stairs up Monks Mound—the largest prehistoric earthen construction in the Americas—to take in breathtaking panoramic views of the distant St. Louis Gateway Arch skyline. The flat grass and gravel trail system weaves through the ancient plaza, past the Woodhenge solar calendar, offering excellent winter birding and crisp walking. The Interpretive Center Lobby provides heated restrooms, educational maps, and site models, with free entry for all visitors. ## Similar picks in St. Louis - [Toddler Thursday at Mastodon State Historic Site](https://grassyknees.com/st-louis/activities/toddler-thursday-at-mastodon-state-historic-site--listing-5eb7d3296ee13b0beb0970e2) — Thu, Nov 19 (+1 more date) · 10:00 AM – 11:00 AM · Mastodon State Historic Site, Imperial · Free · checked Oct 14. Story time and a craft for toddlers and their grown-ups, held outdoors right outside the Mastodon State Historic Site museum (moved to the museum auditorium in bad weather). 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