Ghosts abound at Ohio's state parks and nature preserves. The land was usually given to the state, and the guy who owned the land was always an eccentric crazy who killed people/got killed/killed himself, and so on. Very cool stories at a few of them; my personal favorite is probably the Mushroom Lady at Beaver Creek.

Beaver Creek State Park Lisbon
Berliner Park Columbus
Blue Limestone Park Delaware
Conkle's Hollow Logan
Eden Park Cincinnati
Garfield Park Cleveland
George Rogers Clark Park Springfield
Glen Helen Nature Preserve Xenia
Hopewell Culture State Park Chillicothe
John Bryan State Park Xenia
Lake Hope State Park Zaleski
Library Park Miamisburg
Mohican State Park Mohican
Monroe Lake Woodsfield
Old Man's Cave Logan
Pike Lake State Park Piketon
Punderson State Park Newbury
Serpent Mound Peebles
Schallenberger State Nature Preserve Lancaster