Monks Mound is the largest Pre-Columbian earthwork in the Americas and the largest pyramid north of Mesoamerica. The beginning of its construction dates from 900 to 955 CE. Located at the Cahokia Mounds UNESCO World Heritage Site near Collinsville, Illinois, the mound size was calculated in 1988 as about 100 feet high, 955 feet long including the access ramp at the southern end, and 775 feet wide. This makes Monks Mound roughly the same size at its base as the Great Pyramid of Giza.