National Parks and Monuments
Cuyahoga Valley National Park, Dayton Aviation Heritage NHP, Hopewell Culture NHP, James A. Garfield NHS, Perry's Victory International Peace Memorial, William Howard Taft NHS
Ohio Caverns, West Liberty
The largest of all Ohio caves, open throughout the year, offering guided tours at frequent intervals.
Ohio Parks and Recreation Association
A Nonprofit group representing over 1300 professionals and citizen board members involved in providing leisure facilities and opportunities to all Ohioans as well as the tourists.