“The Hewer,” Halliday Park, Poplar Avenue & 9th Street The Cairo Historical Preservation Project is a not-for-profit organization formed for protecting and preserving Cairo’s historical resources. Our Mission Boatman’s 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. Get Involved These downtown buildings no longer exist. Help us protect and preserve what remains for future generations.