Investigation: National Park Service Long Ignored Preservation Laws In Desecrating Sacred Ground At Effigy Mounds National Monument

Ancestral burial grounds and ceremonial mounds at Effigy Mounds National Monument in Iowa that were considered sacred by a dozen Native American tribes were desecrated by National Park Service managers who "clearly knew what they were doing was against the law" during a decade-long campaign of building boardwalks and trails across the monument grounds, according to a voluminous investigation.