At the city's apex in 1050, the population exploded to as many as 30 thousand people. It was the largest pre-Columbian city in what became the United States, bigger than London or Paris at the time. Its colorful wooden homes and monuments rose along the eastern side of the Mississippi, eventually spreading across the river to St. Louis. One particularly magnificent structure, known today as Monk’s Mound, marked the center of downtown. It towered 30 meters over an enormous central plaza and had three dramatic ascending levels, each covered in ceremonial buildings. Standing on the highest level, a person speaking loudly could be heard all the way across the Grand Plaza below. Flanking Monk’s Mound to the west was a circle of tall wooden poles, dubbed Woodhenge, that marked the solstices.
Despite its greatness, the city’s name has been lost to time. Its culture is known simply as Mississippian. When Europeans explored Illinois in the 17th century, the city had been abandoned for hundreds of years. At that time, the region was inhabited by the Cahokia, a tribe from the Illinois Confederation. Europeans decided to name the ancient city after them, despite the fact that the Cahokia themselves claimed no connection to it. ... 40 years ago when Illinois declared Cahokia a state historic site, and UNESCO granted it World Heritage status. The state bought 2,200 acres of land from residents, clearing away the drive-in and a small subdivision. Now the Cahokia Mounds State Historic Site and Visitors’ Center is devoted to preserving what remains of the ancient city’s monumental downtown architecture.
...
Even with my untrained eye, I could tell she was pointing at overlapping building floors: one area of darker clay ended abruptly in a diagonal line like a wall, and alongside it was a uniformly colored area of clay studded with charcoal and artifacts. The walls themselves, made from posts sunk into the clay, had long ago rotted away.
These structures weren’t modest little homes, either. At least one ritual fire had burned here, its flames consuming valuable offerings like mica, a ceremonial beaker for holding the heavily caffeinated Black Drink, a beautifully woven mat, a pottery trowel imported from a remote village, and an ancient projectile point from pre-Cahokia peoples that would have been centuries old by the time it was buried here. EB 2 and 3 were similarly unusual, yielding finds that suggested feasting and ritualistic earth-moving activities.
What Baires and Baltus thought would be a bunch of private homes turned out to be a public area full of “special use structures,” the preferred archaeological term for any building whose purpose goes beyond the everyday. People used these buildings for everything from political debates and social gatherings to spiritual practices and party venues. Looking over the neighborhood, Baires said simply, "I've never seen anything like this." Following her gaze, I could no longer see the field bordered by trees and distant gas tanks. Instead, there were meeting halls, a wide courtyard with a decorated wooden pole at its center, and a sacred pit where Cahokians borrowed clay for their mounds. A huge trash pile full of deer bones and broken pottery hinted at a big feast.
