We went to the Jefferson National expansion memorial whose best known feature is the Gateway Arch
Views looking down from top of arch
and among other offerings, a nice museum
We then visited remains of the most sophisticated prehistoric native civilization north of Mexico are preserved at Cahokia Mounds State Historic Site. This is currently the largest archeological site in North America.
that crack in the windshield is a memento of earlier in our trip
Cahokia museum houses hundreds of artifacts form the site along with diorama to interpret Mississippian life
Cahokia had been the largest city in North America until Philadelphia reached 30,000 residents (Mississippians). Mississippians of Cahokia had wooden pole versions of something like Stonehenge.
The site is best known for its mounds which were the largest earthen structures north of Mexico
there's significance evidence that they did human sacrifice. I'm fixin to climb the Monk's mound where you would have found the big poobah
Tehy had a calendar along the lines of Stonehenge. Theirs is dubbed Woodhenge. Couldn't get it all in the photo