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The Hewer Halliday Park Poplar Avenue 9th Street The Cairo Historical Preservation Project is a notforprofit organization formed for protecting and preserving Cairos historical resources. Boatmans Memorial at The Point Fort Defiance State Park the confluence of Ohio and Mississippi Rivers most southern point in Illinois State Hwy 60 62 Show your support through financial donations or by joining one of our project committees. These downtown buildings no longer exist. Help us protect and preserve what remains for future generations.