Cahokia Mounds State Historical Site is one of the Illinois parks in thicket's catalog. thicket is a field guide to the parks near you: it maps the ones you have never noticed, gives you a reason to actually go, and keeps a record of where you have been.
Where it is
Cahokia Mounds State Historical Site is in St. Clair County, Illinois. Its approximate coordinates are 38.65244, -90.06473.
Check in at Cahokia Mounds State Historical Site
thicket verifies you are actually here by GPS when you check in, so a visit means you went. Checking in builds a streak, earns achievements, and fills in your map of the places you have been.